Ok first thing you need to do is solve for xOriginally Posted byjodiet50

1) move the -3 to the other side of the equation:

2x = 7 +3 => 2x =10

2) Solve for x by dividing both sides of the equation by 2

x = 5

Now tha you know that x=5 you can plug it into the second equation:

3x+4 => 3(5) +4 => 15 +4 => 19

Hope this helps