the equation is 3x+y=26 x=7

3x+y=27, when x=7

1. Replace any x in the equation with 7.

3(7) + y=27

2. Simplify.

21+y=27

3. Solve for y.

y=27-21

y=6

4. Check your answer by inserting x=7 and y=6 into the original equation.

3(7) +6=27

21+6=27

27=27

Yes, it checks.