SOLUTION: please help me solve this question. y=-3x & 2x-3y=22. they are to the same problem. I can't find the answer. I have to use substitution. I tried for 2 hours and couldn't find

Algebra ->  Finance -> SOLUTION: please help me solve this question. y=-3x & 2x-3y=22. they are to the same problem. I can't find the answer. I have to use substitution. I tried for 2 hours and couldn't find      Log On


   

Question 821860: please help me solve this question. y=-3x & 2x-3y=22. they are to the same problem. I can't find the answer. I have to use substitution. I tried for 2 hours and couldn't find the answer. please help me
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

y=-3x & 

2x-3y=22

 2x - 3(-3x) = 22   |Substituting for y

  2x + 9x = 22

     11x = 22

       x = 2   and y = -6   (-2x)

 P(2,-6) is the solution for this system of Eqs  (Lines intersect at that point)

CHECKING our answer***

Using 2x-3y=22

      4 + 18 = 22