exam Maths Puzzle Numerical Ability

Solve for x: a/(x-3a)=b/(x+3b)

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exam Other Question

What steps are needed to graph the lines lines: y = 0.15x +0.79 : y = 0.11x - y = -0.85 the home work looks like this but i dont know how to do it at all the teacher explained it but i still dont get it. the questions are like... pr=xp i dont know how to do them..and some of them have numbers..how do you do both times