exam Maths Puzzle Numerical Ability

how i can dou that?

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Please help me solve this question.

Find the equation of each line. Write the equation using function notation.

Through (-4,8); perpendicular to 2x - 3y = 1

Thanks. Sample space = {A, B, C, D}

P(A) = 0.2, P(B) = 0.2, P(C) = 0.15, P(D) = 0.45

P(B, C, D) = _____