Shelly J. answered • 01/26/14

Master's degree in Maths with 11+ years of tutoring experience

Hi Roseland,

-8x+y=15 equation 1

2x-2y=-2

x-y=-1

x=y-1 equation 2

put the value of equation 2 in equation 1

-8(y-1)+y=15

-8y+8+y = 15

-7y= 15-8

-7y=7

y=-1

put the value of y=-1 in equation 2

x=-1-1

x=-2

so the solution is x=-2 and y=-1.