exam Maths Puzzle Numerical Ability

y = (sqrt x + 1) - 3

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Problem#1

how can i actually prove it if this is the equation to use.

the problem states:

Prove that if a line has slope ma nd y-intercept b, then an equation of th e in how many ways can you make a four-letter password from A, B, C, D, E if you are not allowed to repete characters?