Question

What is the value of x in the equation 7x + 2y = 48 , when y = 3?

Answer 1

For
7x + 2y = 48
we're given y = 3, so substitute into the equation

7x+2(3) = 48
now multiply 2 and 3
7x+6=48
subtract 6 on both sides
7x=42
divide 7 on both sides
x=6

Answer 2

7x+2y=48
7x+2(3)=48
7x+6=48
Subtract 6 on both sides.
7x=42
divide 7 on both sides
x=6