Mathematics

solve by the elimination method,9x-y=71                                                                                                                     x+8y=16


Answers

StefanieBoyance

4 years ago Comment

Best answer

9x-y=71
x+8y=16

8(9x-y=71)

72x-8y=568
x+8y=16
You add the like terms together and the y's get "eliminated" making it
73x=584
x=8

Plug x into one of the original equations (either one it will give you the same answer)
9(8)-y=71
72-y=71
-y=-1
y=1

x=8 y=1 or (8,1) is the final answer.

Lilgreaser

4 years ago Comment

multiply x+8y=16 by 9 which is 9x+72y=144then you get y=1 after equation worksub y=1 into equation x+8y=16then you get x=8