exam Maths Puzzle Numerical Ability

What is the y-intercept of y=1/2x + b if it passes through (-8,-4)?

a. m = 0
b. b = 0
c. b = -4
d. Insufficent information given

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I have to figure out how to do this but to tell the truth I was never taught how to figure these problems out ..please help

Joe won a lottery jackpot that will pay him $12,000 e Determine which two equations represent parallel lines.
(a) y = x + 4
(b) y = x - 7
(c) y = 2x + 8 (d) y = 2x - 4