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My friend needs help explaining this and I don't know anything.

My friend needs help explaining this and I don't know anything.-example-1
User Abushawish
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To solve this equation (correct me if i'm wrong), you could first multiply the bottom equation by 3, to get 15y. After that, we get -4x-15y=-17 and -3x + 15y=-39, and if we add the 2 equations up, on top of each other, we get -7x=-56, and we can conclude that x=8, and with substitution (-32 - 15y = -17), we know that y=(-1)


Here's what I mean by on-top


-4x-15y=-17

-3x + 15y=-39


-7x=-56

User Casey Flynn
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