book Maths Puzzle Numerical Ability

I need help with a couple of word problems. Please help me? I really have a hard time solving word problems. Thank you

1. A shirt costs $5. Pants cost $4. Shoes costs $10 m

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book Other Question

I need help with Lines.
Question is: Find the slope and y-intercept of each line. y = 2x + 3 I have the answer in the book, However I want to know how they came up with it? Answer:Slope = 2
y-intercept = 3

Thank you Simplify: 2x + 7(x+7) a) -5x + 49 b) 9x + 7 c) 9x + 49 d) 9x-49