book Maths Puzzle Numerical Ability

(-7)x(+3)= the answers are....-4, -21, -10, or 4

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book Other Question

y-4x=8

3y=2x-3

y=-3/4x

-x+y=7

i am supposed to graph the equationsby plotting the points
How do you find the answer to this word problem:


The perimeter of a rectangular garden is 40ft. The width is 2ft. more than one-half the length. Find the length and width.