book Maths Puzzle Numerical Ability

Solve if possible or determine no solution or infinite solutions.

x+3y=-15
2x+5y=-21

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book Other Question

In the diagram above, if O is the centre of the circle, then y=

(A) 25 degrees
(B) 80 degrees
(C) 90 degrees
(D) 100 degrees How do I solve this 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 interest rate increase over the period?

Thanks, She