exam Maths Puzzle Numerical Ability

I have just started on equation substitutions. They are very confusing, and my entire 10th grade class is struggling. can you help me solve this substitution?

4x+y=-2 2x=-y

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exam Other Question

Find the graph of this piecewise function.
Y=f(x-1)-2
I can not figure this out.

A rectangular prism has a square base, a height of 10cm and a surface area of 1,050 square cm. Find its volume.

thankyou. I hope someone can help me.