Re: elimination
Stine said:
4x-3y=17
3* (10x+y=-4)
Is this better?
No. Try English. There is no Distributive Property of Equals. I realize you are trying to invent a useful shorthand. Don't. Please don't invent new notation. There is already way too much.
R1: 4x-3y=17
R2: 10x+y=-4
Multiply R2 by 3, creating a new R2
R1: 4x-3y=17
R2: 30x+3y=-12
Add R1 to R2, creating a new R2
R1: 4x-3y=17
R2: 34x=5
Divide R2 by 34, creating a new R2
R1: 4x-3y=17
R2: x=5/34
Multiply R2 by -4, creating a new R2
R1: 4x-3y=17
R2: -4x=-10/17
Add R2 to R1, creating a new R1
R1: -3y=279/17
R2: -4x=-10/17
Divide R1 by -3 and R2 by -4, giving the final result
R1: y=-93/17
R2: x=5/34
Check Your Answers
You don't have to get quite that chatty about what you are doing, but you do have to write enough, and be clear enough, so that it can be understood, followed, graded, and reviewed.