If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the second equation is substituted into the first equation.
2x-3y=-29
x+4y=13
a) 2(4y+13)-3y=-29
b) 2(-4y+13)-3y=-29
c) 2x-3(4y+13)=-29
d) 2x-3(-4y+13)=-29