exam Maths Puzzle Numerical Ability

I need help solvong a quadriatic equation

x^2+8x-4=0

and

36x^2+24X=7

I need to know how to graph

y=-2/7x+6

and

3x-4y=12

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exam Other Question

solving for variables
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solve for I

A=P+I
The rate of return of certain investments increase as the risk factor of the investment increase.
An investment with a risk factor of 2 has a rate of return of 5.0%.
An investm