Please verify that this Algebra work is correct please

[1babelove]

Homework Statement

1.8x-3 (3x+6)=9 ; the solution is... x=3

2.m+n/10 form m=88 and n=12 /...answer is m+n/10 = 20

3. 2x+5y= 0 x=7-6y, my answer ..The soution is... (-5,2)

4. the function H described by H(x) = 2.75x+ 71.48 can be used to predict the height,
in centimeters, of a woman whose humerus(the bone from the elbow to the shoulder)
is x cm long. Predict the height of a woman whose humeris is 40 cm long.
my answer... The predicted height of a woman whose humerus is 40 cm long is..181.48cm

Homework Equations

The Attempt at a Solution

Please confirm these are correct also..
5.5(w-3)= -15 ...w=0

6. 2x+3y=1 4x+6y=2 (I had to solve with the elimination method)
my answer to what is the solution of the system is...No solution

7. 8x-(3x+6)=9 ...my answer is x=3

8. -0.4x<-24..my answer The solution is x..<60

9.4>-3x+3 or 10<(or equal to)- 4x+5...answer ..negative infinity, -5/4

10. 2x+9y=1 are (8,7) the solution...answer ...No

11. 6[45-(54-49)] equals...answer 240

12. 9/7*(8/3) = -24/7

13. -5/8X= -9/10 The solution/answer is 36/25

14. -2x>1/9 ..the solution answer is x/x< -1/18

15.
5x+2y=8
5x+2y=2 ...answer these pair of lines are parallel and not perpendicular

16.

6+7x<20...answer x/x<2

17. -19<(or equal to)3x-2<(or equal to)-1...answer x/ -17/3<(or equal to)x<
(or equal to) 1/3

 

[Cyosis]

You can check these yourself. You found an answer now simply put the value for x in the original equation. If the equality holds you have the right answer, if it does not you have the wrong answer.