MHB Solve Simultaneous Equations y=2x²+3x-31 & y=21-2x

Click For Summary
To solve the simultaneous equations y=2x²+3x-31 and y=21-2x, equate the right-hand sides to find x. The discussion emphasizes the importance of understanding the calculations rather than simply receiving the answer. A suggestion was made to work through the problem independently for better learning. Participants encourage engagement with the problem to enhance comprehension. Ultimately, solving these equations requires careful substitution and algebraic manipulation.
ladybutterz
Messages
4
Reaction score
0
y=2x²+3x-31
y=21-2x
solve for x and y
 
Mathematics news on Phys.org
Equate the right-hand sides.
 
Evgeny.Makarov said:
Equate the right-hand sides.
yea but i really need help don't really understand need to see the calculation to understand it properly
 
ladybutterz said:
y=2x²+3x-31
y=21-2x
solve for x and y

I have moved this topic as it is a better fit here in the Pre-Algebra and Algebra sub-forum.

The suggestion given by Evgeny.Makarov is an excellent one, and you should be able to make at least some progress with it. If he does it for you, you will learn less than if you attempt it yourself. :D
 
Thread 'Erroneously finding discrepancy in transpose rule'

Thread 'Erroneously finding discrepancy in transpose rule'

Obviously, there is something elementary I am missing here. To form the transpose of a matrix, one exchanges rows and columns, so the transpose of a scalar, considered as (or isomorphic to) a one-entry matrix, should stay the same, including if the scalar is a complex number. On the other hand, in the isomorphism between the complex plane and the real plane, a complex number a+bi corresponds to a matrix in the real plane; taking the transpose we get which then corresponds to a-bi...
View full post »

Similar threads

MHB Solving $\tan^2x + \tan^2{2x} + \cot^2{3x} = 1$ in R
  • · Replies 6 ·
Replies
6
Views
1K
MHB Solving the Equation: x+[2x]+[3x]=7
  • · Replies 4 ·
Replies
4
Views
1K
MHB Equation 2: Prove that ##x^2+2x\sqrt x+3x+2\sqrt x+1=0##
  • · Replies 4 ·
Replies
4
Views
1K
B Can 2x/3x Equal 2/3x Squared on a Graphing Calculator?
  • · Replies 3 ·
Replies
3
Views
1K
I Using an array to solve a system of equations
  • · Replies 7 ·
Replies
7
Views
2K
MHB Absolute Value Equation |3x - 2|/|2x - 3| = 2
  • · Replies 10 ·
Replies
10
Views
2K
MHB Quadratic equations ( solving for zeros/roots) trickey
  • · Replies 1 ·
Replies
1
Views
1K
MHB Solve System of Inequalities: 2x+3y-4, 3x-4y+5
  • · Replies 8 ·
Replies
8
Views
1K
MHB Solve Inequality & Simul Eqns: Alg Workings Q (a,b,c)
  • · Replies 1 ·
Replies
1
Views
1K
MHB Solve Absolute Value Equation |(2x + 1)|/|(3x + 4)| = 1
  • · Replies 4 ·
Replies
4
Views
1K