book Maths Puzzle Numerical Ability

2(5a-2)+3(4-7a)=-25

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book Other Question

A line with a slope of 1/2 is drawn thru point P at (-2,,2). Moving from left to right, what is the next ordered pair of whole numbers on the line?

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How does one figure out this answer?
Simply: (2 -3x)^2 I need to really understand how they came up with the answer to this one, I have my final tomorrwo. Th e other problem is find the y intercept for 2x - 3y =6. Thank you so very much for any help. Thank you Thank you.