SOLUTION: how do u solve for substitution y=3x 5x+2y=

Algebra ->  Expressions-with-variables -> SOLUTION: how do u solve for substitution y=3x 5x+2y=       Log On


   

Question 367408: how do u solve for substitution
y=3x
5x+2y=
Found 2 solutions by robertb, Edwin McCravy:
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
The bottom is not an equation, just an expression.

Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
how do u solve for substitution
y=3x
5x+2y=
You forgot to put the number after the equal sign on the second equation.

I will assume you meant it to be 22.  So I'll pretend it's this:

         y = 3x
   5x + 2y = 22

Replace the y in the 2nd equation by what y equals in the 1st, namely (3x)

5x + 2(3x) = 22
   5x + 6x = 22
       11x = 22
         x = 2

Substitute (2) for x in y = 3x

         y = 3x
         y = 3(2)
         y = 6

Edwin