exam Maths Puzzle Numerical Ability

Graph the inequality.

y < -1

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exam Other Question

I am stuck on correct answer for:

what are all possible values of X such that X^2 = 5x

I am not using any specific book. I am just practicing.. How do i prove that given triangle ABC with the altitude from B of the same length as the altitude from C, then the triangle must be isosceles.
I can prove this question without it saying altitude that is where i am confused.
thank you
Nadia