# Search results

1. ### Proof involving linear algebra

1. Homework Statement Hi, I'm supposed to solve the following question using proof by induction, and am very confused with it. It would be greatly appreciated if someone could help me solve this problem: Let an = 2 and an+1\frac{4a_n -3}{a_n} for n >=1. Show that 1\leq a_n \leq a_(n+1)\leq3...
2. ### Problem with Sets

Hi, I'm having a lot of trouble with the following question: 1. Homework Statement (a) Let x,y ∈ Z. Prove that if x>0 and x+y <xy, then y>0 2. Homework Equations x+y <xy, then y>0 3. The Attempt at a Solution I am very confused with this problem, and am not even sure on how...
3. ### Finding Ordered pair question

Hey, thanks for the help. So after this step, do we use trial and error to find the correct solution. I am getting one ordered pair, (9,9), and (-9,-7) after all the math(since x, and y can only be integers). I would really appreciate it if you could confirm this. Thank you
4. ### Solve the equation

1. Homework Statement Hello, I'm having some trouble with the following problem: Solve y = x+\frac{1}{x} for 0 < x \leq 1 2. Homework Equations y = x+\frac{1}{x} for 0 < x \leq 1 3. The Attempt at a Solution I am not sure on how to start. I've spent a lot of time thinking...
5. ### Finding Ordered pair question

1. Homework Statement Please find all ordered pairs of integers (x,y) such that x2 + 2x + 18 = y2 2. Homework Equations x2 + 2x + 18 = y2 3. The Attempt at a Solution Im not sure on how to begin. I tried square-rooting the expression, to solve for y, turning it into y = \sqrt{x + 2x +...
6. ### Trigonometric equations question

Yes, this is precisely where I'm stuck. I'm not sure on how to proceed after this step.
7. ### Trigonometric equations question

Yeah, sorry, my mistake I did actually try tan x = \frac{cos x}{sin x}, and tried to solve for a common denominator, cos (x), but am still very confused.
8. ### Trigonometric equations question

1. Homework Statement Solve for x for 0\leq x\leq 2 \pi in the following equation: sin x tan x + tan x - 2sinx + cos x =0 2. Homework Equations N/A 3. The Attempt at a Solution I tried making tan x = \frac{cos x}{sin x}, but did not have any luck, and am very confused on how to solve...
9. ### Trig derivative applications answer check!

1. Homework Statement The base of an isosceles triangle is 20 cm and the altitude is increasing at the rate of 1 cm/min. At what rate is the base angle increasing when the area is 100 cm^2? 2. Homework Equations 3. The Attempt at a Solution Im very unsure about my solution method. I...

1. Homework Statement Find the equation of the plane that passes through the line of intersection of the planes x - 3y - 2z - 1 = 0 and 2x + 4y + z - 5 = 0 and parallel to the x-axis. 2. Homework Equations 3. The Attempt at a Solution Find the line of intersection for...
11. ### Schools University of Waterloo

thanks for the link...looks impressive (especially the part that microsoft hires most of its employees from Waterloo)..
12. ### Velocity/acceleration using derivatives (answer check)

ok, how could I find the speed..would I need to divide it by 4s? yes, thats a typo. is the answer 4.875 correct? But is my assumption correct? should I just put down that the object is moving away from the origin at t= 3? Thanks!
13. ### Schools University of Waterloo

Hey everyone! I got accepted to the university of waterloo for computer science honours (BCS), and was wondering about the university's reputation. I know that its considered to be a very good school in Canada (one of the best), but what about international reputation? is it known to be a...
14. ### Velocity/acceleration using derivatives (answer check)

1. Homework Statement An object is traveling along a linear path according to the equation s(t) = 4t^3 - 3t^2 + 5 where t is measured in seconds and s(t) measured in meters. 1. How fast is the object moving at t = 4 seconds? 2. What is the position of the object when it stops...
15. ### Planar Intersections (Answer Check)

Thank you. Just one more question: when it says to interpret the result geometrically, do I have to graph it? or is it just stating the facts that we discussed above?
16. ### Planar Intersections (Answer Check)

Thanks Tedjn So, there is an intersecting line? because I'm really confused; isn't 0=8 a false statement, meaning that the planes are neither parallel, nor they intersect. Is this an example of planes intersecting in pairs? could you please elaborate a little. Thanks! :smile:
17. ### Planar Intersections (Answer Check)

1. Homework Statement Solve the following systems and interpret the result geometrically x - y - 2z - 3 = 0 2x - 3y - 3z + 15 = 0 x - 2y - z + 10 = 0 2. Homework Equations 3. The Attempt at a Solution x - y - 2z - 3 = 0…………….(1) 2x - 3y - 3z + 15 = 0……….(2) x -...
18. ### Planar intersection question

1. Homework Statement Find the equation of the plane that passes through the line of intersection of the planes 4x - 3y - z - 1 = 0 and 2x + 4y + z - 5 = 0 and passes through A(1, -3, 2). 2. Homework Equations N/A 3. The Attempt at a Solution I have no clue on how to start this...
19. ### Plane intersections

1. Homework Statement Find out if the following planes and lines intersect. If they intersect, state the point of intersection Plane: 2x + y + 3z = 10 Line: Passing through the point A(1, 5, 1) and B(0, 4, 2) 2. Homework Equations 3. The Attempt at a Solution I have solved...
20. ### Lines and Plains

Thanks! So, for the example, could I use the following: Point A (1,-5,0) Point B (3,-9,0) Direction vector: [3-1,-9-(-5),0] = [2,-4,0] So therefore the parametric equation would be: [x,y,z] = (1,-5,0) + t[2,-4,0] x = 1 + 2t y = -5-4t z = 0 Is my method correct...
21. ### Lines and Plains

Thanks Mark 44! what would this result mean?, other than that the z is constant.. are there any connections between this, and the other two planes?
22. ### Lines and Plains

Thank you, ok, so the following are the parametric equations: x = x1 y = y1 z = z1 Symmetric equations: x-x1 y-y1 z-z1 Is this correct?, and what exactly does it mean in this context.. Thanks LCKurtz!
23. ### Lines and Plains

so basically, my equations are correct, as they demonstrate that the line is not parallel to any other axis..and could you please explain what you think this result means.. Thanks!
24. ### Lines and Plains

Thanks Mark 44, and LCKurtz Parametric: x =x1+at y =y1+bt z =z1 Symmetric equation: t = (x-x1)/a t = (y - y1)/b 0 = z-z1 So basically, the z value is constant? I came to that conclusion too, but what about it not being parallel to any of the axis? I am fine with the former, but...
25. ### Lines and Plains

EDIT: Sorry I made a spelling error in the title: its supposed to be Planes 1. Homework Statement Recall that there are three coordinates planes in 3-space. A line in R3 is parallel to xy-plane, but not to any of the axes. Explain what this tells you about parametric and symmetric equations...
26. ### Equations of Lines and Vectors

Thanks tiny-tim, so basically, I will need to find three points for each line (therefore use three different values for t) so that I get: [x1, y1, z1] [x2, y2, z2] [x3, y3, z3] Thanks again!
27. ### Equations of Lines and Vectors

1. Homework Statement Find the coordinates of three points on each of the following lines. a. (x+2)/3=(y-1)/2=(z+5)/(-3) x = -1 + 5t b.y = 7 + t z = 3 - 2t 2. Homework Equations (x+2)/3=(y-1)/2=(z+5)/(-3) x = -1 + 5t y = 7 + t z = 3 - 2t 3. The...
28. ### Parametric/vector equations

ok, so something like (1,0,0) would work? your point makes sense, just want to confirm..
29. ### Parametric/vector equations

bump..anyone?
30. ### Parametric/vector equations

so would the (0,1,1) work?