What is the answer to 6x?

Answer 1

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.