SOLUTION: I need help with solving systems of equations So the first method i need help with is elimination, here is the problem {15x-5y=30 {y=2x+3 Then i need help with the second me

Algebra ->  Equations -> SOLUTION: I need help with solving systems of equations So the first method i need help with is elimination, here is the problem {15x-5y=30 {y=2x+3 Then i need help with the second me      Log On


   

Question 856615: I need help with solving systems of equations
So the first method i need help with is elimination, here is the problem
{15x-5y=30
{y=2x+3
Then i need help with the second method the graphing method
it is the same system as you see above
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

doing the Graphing First

y = 2x+3 green  p(0,3) and P(3,9) Plot, connect with line

y = 3x-6 blue   P(0, -6) and P(2, 0) Plot, connect with line

Line intersect at(9,21), x = 9,  y = 21 the solution



Let's see

15x - 5y = 30

 2x - y = -3  Multiply by 5 and subtracting from 1st EQ to eliminate y

     5x = 45

      x = 9  and using y = 2x+3,  y = 21