exam Maths Puzzle Numerical Ability

Solve by graphing.
2x+y=1
x-y=2

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exam Other Question

An open box is to be constructed from a square piece of sheet metal by removing a square of side 1 foot from each corner and turning up the edges. If the box is to hold 4 cubic feet, what should be the dimensions of the sheet metal? What are the solutions of the following?
(x - 5)(x + 3) = 0

a. 5 and -3
b. 5 and 3
c. -5 and -3
d. -5 and 3