SOLUTION: Hi! would anyone know how to work problem -15x - 4y = -20 and 5x + 7y = 90 and show in detail about how you came up with a solution?

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Question 712540: Hi! would anyone know how to work problem -15x - 4y = -20 and 5x + 7y = 90 and show in detail about how you came up with a solution?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
-15x - 4y = -20
5x + 7y = 90
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Multiply the 2nd eqn by 3, then add them