Answer:
(-3,4) for the second problem
Explanation:
This is a system of equations. We can solve the first for y and use that in the second.
Solve first one for y:
3x + y = -5
y = (-3x - 5)
Use this value for y in the second equation:
8x + 7(-3x - 5) = 4
8x - 21x -35 = 4
-13x = 39 (divide both sides by -13 here)
x = -3
Now put this value for x into one of the original equations to get y:
3(-3) + y = -5
-9 + y = -5
y = 4
You can put these x and y values into the original equations to check your work.