exam Maths Puzzle Numerical Ability

Rewrite the equation as a function of x.
-3x+4y=11

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exam Other Question

what are the steps and some example. For Soling systems of equations. like
y+x=4
y=-4x+10 Will a single sheet of paper which measures 28.25" by 25.5" be enough to wrap a box which is a foot long, a foot wide, and a foot high?

I have tried everything i just cant figure out this problem.
please help me.