book Maths Puzzle Numerical Ability

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

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book Other Question
Without graphing, identify the following pair of lines as either "parallel", "perpendicular", or neither.

y = 4x + 4
y = -4x +3 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