exam Maths Puzzle Numerical Ability

Find the x-intercepts.

y=x^2-2X-15

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exam Other Question

On the 24-mile trip to school, Brandon sauntered at a leisurely pace. Thus, he had to double his speed on the way back to complete the trip in 9 hours. How fast did he travel in each direction, and what were the two times? I tried this over and over and can not get this:

Solve the following system by graphing:

3x - 6y = 9 :EQUATION 1
X - 2Y = 3 : EQUATION 2

Y-INTERCEPT AS AN ORDERED PAIR =>