exam Maths Puzzle Numerical Ability

Use elimination to slove: 3x-2y=6
x-2y=-2

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exam Other Question

Use a table of values to graph f(x) and g(x) on the same set of axes.
f(x) = 2^3x and g(x) = 8^-x
I am having difficulty with picking the x values what x values would be suitab 28. Slope 1/2; y intercept (o, -6)

Can you please help me with this one?

Thanks
Carolyn