exam Maths Puzzle Numerical Ability

decide whether the graphs of the two equations are parallel lines:
3y=x-12,6y=2x+12

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exam Other Question

If f(x) = 4x - 6, what is f(-3)?
Thank you Can someone help me on this problem?

I need t solve the system by addition:

x + y = 6
x - y = 4

Thank you,
Lisa