book Maths Puzzle Numerical Ability

what would be the coordinate for y=-4x+2 on a coordinate grid

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Please Help Me Again!!Thanks For The Other Help,too!
5x=4y-7
4x=5y-2
thank you!!!!!!!!!! One day in math class, shelley ask the teacher, " Mr. Nelson, how old are you?"
Mr.Nelson responds: "This year Iam 3 times as ols as my sister. How ever. 6 years ago, I was five times as old as she was". How old is the math teacher?