SOLUTION: can you help me solve substitution y=3x and y-x=4

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: can you help me solve substitution y=3x and y-x=4      Log On


   

Question 698891: can you help me solve substitution y=3x and y-x=4
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hint:

y = 3x, so you can replace the 'y' in y - x = 4 with 3x to get

y - x = 4

3x - x = 4

2x = 4

I'll let you finish in solving for x. Once you have the solution for x, use it to find the solution for y.