Solve the following system:
{y = x+9
3 x+8 y = -5
Substitute y = x+9 into the second equation:
{y = x+9
3 x+8 (x+9) = -5
3 x+8 (x+9) = (8 x+72)+3 x = 11 x+72:
{y = x+9
11 x+72 = -5
In the second equation, look to solve for x:
{y = x+9
11 x+72 = -5
Subtract 72 from both sides:
{y = x+9
11 x = -77
Divide both sides by 11:
{y = x+9
x = -7
Substitute x = -7 into the first equation:
{y = 2
x = -7
Collect results in alphabetical order:
Answer: |x = -7 and y = 2
