exam Maths Puzzle Numerical Ability

I need help on these problems.

A=1/2bh for h

I=prt for p

ax+by=c fro y

P=2(l=w) for l

y=mx+b for x

ax+by=c for y

P=2(l+w) for l

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exam Other Question

Complete the ordered pairs for the equation y = 8x + 16.
(0),(7/8),(0),(-7/8)
Yuri has a board that is 98 in long. He wishes to cut the board into two pieces so that one piece will be 10 in. longer than the other. What should the length of each piece be?