Question

What is the subsitution for 2x=12 &x-5y=-29

Answer 1

Answer: (6, 7)         x = 6
                                y = 7

Isolate x in the first equation.
2x = 12                   Divide by 2 to both sides
x = 6                       Isolated x!

Substitute in (6) for x in the second equation.
(6) - 5y = -29         Remove parenthesises
6 - 5y = -29           Subtract 6 from both sides
-5y = -35               Divide by -5 to both sides      
y = 7                      Isolated y!

With x = 6 and y = 7:
(6, 7)