book Maths Puzzle Numerical Ability

Find the x-intercept and y-intercept of the equation 5x − 3y = 30.

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book Other Question

use cross products to setermine whether each pair of ratios forms a proportion. is the answer yes or no?
the problem...
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i cross multiplied but i keep on messing it up Ok, so I'm given 3 points of a parabola :(9,16) (0,12), and (27,0)..(9,16) is the vertex, (27,0) is an x-intercept, and (0,12) is the y-intercept. It can be inferred that (-9,0) is