Question

[WILL FAN AND MEDAL]


Which value of x satisfies both -9x + 4y = 8 and -3x − y = 4?

Answer 1

http://openstudy.com/study#/updates/4e7e2e4e0b8b8ad5b6ae81d3

Answer 2

We will solve this using system of equations.

-9x+4y=8
-3x-y=4

y= -3x-4 (isolate the y)
-9x+4(-3x-4)=8 (plug the equation for y back into the first equation)
-9x-12x-16=8
-21x-16=8
-21x=24

this leaves us with x= -8/7

Now plug x into one of the original equations and solve for y.
-3(-8/7)-y=4
24/7-y=4
24/7-4=y

And so y= -4/7