exam Maths Puzzle Numerical Ability

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

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exam Other Question

Solve x over 6 + 3 = 0


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


This is a Substitution problem and i need help