y = 18; y = -3(x - 18)^2 + 15; If the given equations are graphed in the xy-plane, at how many....

Bluebook Digital SAT Practice Test 5, Section 2, Module 2 (HARD), Question 8:

y = 18
y = -3(x - 18)^2 + 15
If the given equations are graphed in the xy-plane, at how many points do the graphs of the equations intersect?

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[OverclockingCowboy]

It can be observed that the second equation is in the vertex form. It is a parabola facing downward with vertex at y=15. Thus, for any line to intersect the parabola, its value y value has to be less than or equal to 15.