SOLUTION: solve with substitution 15x +9y =240 (1) 6x +3y =90 (2) this is what i have so far and am stuck on how to finish... 15x + 9y = 240 9y - 240 - 15x 6x + 3*9(240

Algebra ->  Expressions-with-variables -> SOLUTION: solve with substitution 15x +9y =240 (1) 6x +3y =90 (2) this is what i have so far and am stuck on how to finish... 15x + 9y = 240 9y - 240 - 15x 6x + 3*9(240       Log On


   

Question 477678: solve with substitution
15x +9y =240 (1)
6x +3y =90 (2)
this is what i have so far and am stuck on how to finish...
15x + 9y = 240
9y - 240 - 15x
6x + 3*9(240 - 1x) - 90
6x + 6360 - 9x = 90

this is not looking right and am not quite sure i have it going the right way.
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
15x +9y =240 (1)
6x +3y =90 (2)
18x+9y=270
9y=270-18x
15x+270-18x=240
30=3x
x=10
y=10
Solved by pluggable solver: Linear System solver (using determinant)
Solve:
+system%28+%0D%0A++++15%5Cx+%2B+9%5Cy+=+240%2C%0D%0A++++6%5Cx+%2B+3%5Cy+=+90+%29%0D%0A++

Any system of equations:


has solution

or



(x=10, y=10}