exam Maths Puzzle Numerical Ability

help me solve please:
y+3x=9

i dont get how to solve/get for x & y.

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I would like to know how to find out the feasible region of a linear programming equation. I need the answer as soon as possible. I'm stuck again in the percent department,I have some more problems I need help with,I guess this is where my weakness is in, in math.The first problem is the cost of a computer de