book Maths Puzzle Numerical Ability

Describe a first step for solving each system using elimination. Then solve each system.

2x-y=6
-3x+4y=1

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book Other Question

I need the particular function f(x)=1/(sqrt1-x^2) graphed but i don't understand what or how to graph something like this? Could you help me solve the following problem?

The interest rate on an auto loan in May was 12 3/8%. By September the rate was up to 14 1/4%. How many percentage points did the interst rate increase over the period?