How would you solve this using substitution method

x+7y=50
9x+6y=-6

x+7y=50
9x+6y=-6
9x+63y=450 (multiply top equation by 9)
-9x+6y=-6 (subtract bottom equation)
57y=456
y=8 (divide both sides by 57)

x+7(8)=50 (substitute in value of y)
x+56=50
x=-6 (subtract 56 from each side)

(9x-6)+(6x8) (substitute both values into second equation to check)
-54+48=-6