exam Maths Puzzle Numerical Ability

i have to find an equation of a line that goes through the point (2,1) and has a slope of 4.
i have to leave it in slope intercept form.

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exam Other Question

Let P(x) be the probability function of a discrete random variable x which assumes the values x1, x2, x3, x4, such that 2P(x1) = 3P(x2) = P(x3) = 5P(x4). Find the probability distribution of x. my teacher wants me to simplify by factoring but i never done it w/ 2 variables
my promblem was 2g -6h/ divide by 9hsquare - 8square, first i did 8 square and got 64 so then