SOLUTION: 0.05x + 0.25y=66 0.15x + 0.05y=72 Solving by elimination.

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Question 140902This question is from textbook
: 0.05x + 0.25y=66
0.15x + 0.05y=72
Solving by elimination. This question is from textbook

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
0.05x + 0.25y=66 multiply this equation by -3 & add.
0.15x + 0.05y=72
-.15x-.75y=-198
--------------------------
-.7y=-126
y=-126/-.7
y=180 answer.
.05x+.25*180=66
.05x+45=66
.05x=66-45
.05x=21
x=21/.05
x=420 answer.
proof:
.15*420+.05*180=72
63+9=72
72=72