Question

What is the x-coordinate of the solution for the system of equations?

{y−x=9
{10+2x=−2

Enter your answer in the box.
x =

Answer 1

Y – x = 9

10y + 2x = -2

Using the first equation

Y = 9 + x

Substitute to the 2nd equation

10( 9 + x ) + 2x = -2

90 + 10x + 2x = -2

12x = -92

X = -23 / 3