exam Maths Puzzle Numerical Ability

Verify the identity help needed?

sinx+siny/sinx-siny= tan(x+y/2)cot(x-y/2)

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exam Other Question

I need help with this one please. I have to graph and identify the y intercept
y = 3/2x + 2 Thanks so much for any help. What should i do for this problem: Line through (1,-3) parallel to 2x-3y=7