exam Maths Puzzle Numerical Ability

20. 8x - 4y = 16
y = 2x - 4

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Charlie Consumer's credit card balance on April 1st was $40. On April 7th, he made a $10 payment and on April 25th he charged a $25 item. If his credit card company charges a fina How do I convert to slope intercept form to graph? I know that y=mx+b but in the example Y=X-6 how would I go about this?
y=x-6 as I am at a total loss.