What is the best first step for solving the given system using substitution while avoiding fractions? 2x+6y=7 6x+18y=24 a. solve for x in the first equation. b. solve for y in the first equation. c. solve for x in the second equation. d. solve for y in the second equation.

Solve with subsitution avoiding fractions

2x+6y=7
6x+18y=24

if we solve for x in first, we get x=-3y+7/2, has fractions so no
if we solve for y in first, we get y=-x/3+7/6, has fractions so no
if we solve for x in the 2nd, we get x=-3y+4, no fractions so yay
if we solve for y in the 2nd, we get y=-x/3+4/3, has fractions so no

answer is C