exam Maths Puzzle Numerical Ability

Solve the system by addition.

4x+8y=-1
8x-4y=-7

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exam Other Question

I am having a very hard time trying to figure this out. Can you please help me?

Find the axis of symmetry.

y = -x squared + 6x - 2 i am having a problem because on number 10 in my work book it say "do the data in each table represent a linear function? if so write the function."
what i don't understand is ho