exam Maths Puzzle Numerical Ability

Please help me solve this. I am so confused. Thank you so much.
Find the y and x intercept for the equation -15x + y = 55

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exam Other Question

i need to factor the quadratic expression completely and find the roots of this expression. i came up with (15x-13) & (9x-7) is this correct for this problem? Thank you.
135x2 - 222x + 91 I need help!

Express as a polynomial

(x+a)[x^2-ax/x]

How do I figure this out?