Question

Solve 3x + y = 10 when y = 3

Answer 1

3x + 3 = 10

3x = 10 - 3

3x = 7

x = 7/3 or 2.33

Answer 2

3x+3=10

3x=7

x=7/3

to answer this you would substitute the y value into the standard equation and just solve for x