book Maths Puzzle Numerical Ability

i need help on solving this:-2x+3y=-14
2x+2y=4 solve for x and y

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book Other Question

The sales price of a car is $12,590 which is 20% off the original price. What is the original price. I want the explanation of how this is solved. The answer is already on here but there is no explanation. Having trouble understanding this!


2) For the function y = x^2 - 6x + 8, perform the following tasks:
a) Put the function in the form y = a(x - h)^2 + k.
Answer:
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