exam Maths Puzzle Numerical Ability

The length of a rectangle is 5 less than thrice its width. Find the dimensions if the area is 112 squared cm.

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Please help me with these problems.I cant figure them out.

SIMPLIFY EACH OF THE FOLLOWING.BEGIN WITH THE INNERMOST PARENTHESES.

1). (8x-y)-[-(2x + y)-(3x-6y)]

2). 6 Write the equation of the line with slope -2 and y-intercept (0,0). Then graph the line. The equations I have are:
a)y = -2x
b) y = -2x
c)y = x - 2
d)y = x-2

Thanks for any assistance you could give for this problem. Thanks.