Solve x
Substitute -y+6 for x in 3x-4y=-31
3x-4y=-31
3(-y+6)-4y=-31
Simplify both sides of the equation
-7y + 18 = -31
Add -18 to both sides
-7y+18-18=-31-18
7y= -49
Divide both sides by -7
7y/-7= -49/-7
y= 7
Substitute 7 for y in x = -y+6
x= -y+6
x= -7+6
Simplify both sides of the equation
x= -1
Answer : x= -1 and y = 7
I hope that's help and have a great night !