What should you substitute for x in the second equation (bottom equation) in order to solve the system by the substitution method

Question

What should you substitute for x in the second equation (bottom equation) in order to solve the system by the substitution method

3x + y = 3

2x - 5y = 6

Answer 1

solve the 1st equation for x = (3-y)/3 = 1-y/3 and substitute that

in the 2nd equation to get

2(1-y/3) -5y = 6

2 -2y/3 -5y = 6

17y/3 = -4

y = (3/17)(-4) = -12/17

x= 1-(1/3)(-12/17) = 1+4/17 = 21/17