PSAT Math Grid-Ins Question 110: Answer and Explanation
Question: 110
y = –3x2 + x = 
What is the value of the y-intercept of the equation above when it is graphed in the xy-plane?
Correct Answer: 
or 0.5
Explanation:
or 0.5
The question asks for the value of y-intercept of an equation. The y-intercept of a graph is defined as a point where the graph intersects the y-axis, or when x = 0. To find the y-coordinate at that point, plug x = 0 into the equation. The equation becomes y = –3(0)2 + (0) + , which simplifies to –3(0) + , or . The correct answer is or 0.5.
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