exam Maths Puzzle Numerical Ability

I need to graph this problem.

Slope: 5;y-intercept;(0,-2)

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exam Other Question

x2 + 5x - 6 = 0
Assuming the truth of the theorem that states that √n is irrational whenever n is a positive integer that is not a perfect square, prove that √2 + √3 is irrational.