Solve the equation by the substition method. x-y=11 3x+10y=-6?

Answer 1

first equation: x-y=11 ---> x = y+11
sub into 2nd
3x + 10y = -6
3(y+11) + 10y = -6
3y + 33 + 10y = -6
13y = -39
y = -3 , then
x = -3+11 = 8