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 - 36-4y + 13) = -29