SOLUTION: {5x+9y=-54} {2x+y=20} A. find the solution, show your work b. explain and graph.

Algebra ->  Equations -> SOLUTION: {5x+9y=-54} {2x+y=20} A. find the solution, show your work b. explain and graph.      Log On


   

Question 1016389: {5x+9y=-54}
{2x+y=20}
A. find the solution, show your work
b. explain and graph.
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
{5x+9y=-54}
{2x+y=20}
multiply the bottom by -9
5x+9y= -54
-18x-9y=180
-13x= -234
x=18
y= -16 substituting into second equation
substitute both into first to check
90-144=-54.
graph%28300%2C200%2C-20%2C20%2C-20%2C20%2C%28-5x%2F9%29-6%2C-2x%2B20%29