solving a system by substitution

Question

3x+7y=-6

x+6y+2=0

 

 I have a problem when you have to move the equation and make it into one. 

Answer 1

solve the system by substitution

3x+7y=-6

 

x+6y+2=0 ==> x=–6y–2

 

3(–6y–2)+7y=-6

 

Take it from here, Melanie.