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I'm betting you meant 6x-3y=15.

I'm going to factor this.

3(2x-y)=15

3(2x-y)/3=15/3

2x-y=5

Let's assume y=-1, shall we?

2x-(-1)=5

2x+1=5

2x+1-1=5-1

2x=4

2x/2=4/2

x=2

Let's plug them into the original equation, shall we?

6(2)-3(-1)=15

12-(-3)=15

12+3=15

15=15

It's true.

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Meredith Feest

Lvl 9
2y ago

What else can I help you with?