exam Maths Puzzle Numerical Ability

Okay, only four problems left for my homework assignment and I cannot figure them out (go figure). I am suppose to solve the rational equations, and I can not seem to get the right

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exam Other Question

What are the roots of the equation x^2+9=0 I got x=+-3i,can someone explain? Question #1- Write the equation of the line with x-intercept (12, 0) and y-intercept (0, 4).

Question #2- Rewrite the equation 2x - 9y = -72 as a function of x.

Question #3- Given y = 5x2 (5x2this is 5x squared) , find y when x = -2.