Question 69915
I'm not sure I'm reading your notation right, but I'll see what you're doing wrong. You have 2 equations x-2y=-8 and y= -x - 2 given to you, so you can use one equation to solve for another. For instance, since y=-x-2 you can substitute that y value for the y value in the first equation
Equation 1{{{x-2y=-8}}}
Equation 2{{{y= -x - 2}}}Plug this y into the y of the first equation
Equation 1{{{x-2*(highlight(-x - 2))=-8}}} The red box is where the y was originally
{{{x-2(-x - 2)=-8}}} Solve for x
{{{x+2x+4=-8}}}
{{{3x+4=-8}}}
{{{3x=-12}}}
{{{x=-4}}}
Use this x value to solve for y
{{{y=-x-2}}}
{{{y=-(-4)-2}}}
{{{y=4-2}}}
{{{y=2}}}