exam Maths Puzzle Numerical Ability

Please help me on how to figure out the y-intercept of the graph of the equation y=x2 (this is x squared) 6x = 9 and -3/2 (x-6)2 (squared).

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exam Other Question

@ noon a train leaves bridgton heading east at 90 mi/h to cogsville, 450 mi away. at 12:15 p.m. a train leave cogsville heading west to bridgton at 100 mi/h. at what time will they pass each other? Rewrite the equation to standard form?
-16x^2-128x+12y^2-48y-400