exam Maths Puzzle Numerical Ability

How do I find the y-intercept for -x + 3y = 15?

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exam Other Question

calculate the distance between two points:
a. (0,0) and (-3,4) b. (2,1) and (7,13)

D= sqrt [(x2-x1)squared+(y2-y1)squared] I am having difficulty with this equation.
Find the inverse of the function,

f(x) = (3 + 2x)/(2-5x)