book Maths Puzzle Numerical Ability

[2x+3/2]2(square)=49/25

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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 im so sorry, i was sick and my teacher was gone when i came back, so left out
how would i sipmlify radican 15/49