exam Maths Puzzle Numerical Ability

Find the equation of each line in the form y = mx + b if possible.

The line through the origin that is perpendicular to the line through (-3,0) and (0,-3)

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To clarify....Please help me solve the indicated operation. Thanks!

4.5-3.4^2 / 6-8.2 (the period is for multiplication)
How could I solve equations like these:
8(p-2)>5p+7

And how can this be solved:
∆ABC is isosceles with base BC. If AB=3x+1 cm, AC=2x+5 cm, and BC is=x+11, find the perim