exam Maths Puzzle Numerical Ability

I need help in learning how to solve by graphing and getting the solution such as 2-y=4
2x-y=6

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to write a problem in standard form do I write the equation in slope intercept form? this is my problem (0,5) m=3/5 Please help me clear this up. The way I did it was 0x+5=m joe purchased a jacket at a 10% discount sale for 121.50 what was the original price of the jacket