exam Maths Puzzle Numerical Ability

2) 3x+y=2 4x+y=20

This is a Substitution problem and i need help

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exam Other Question

Hi, i'm really having trouble with these two problems. The problem is like this
y=-3x+3 and i have to complete a table of values, i know that i have to put in the numbers that ar what is the solution for 3x-2y=6