4
QuizMultiple Choice

Solving One-Variable Equations with Systems — Quiz

Question 4 • Mathematics III

What are the two solutions of x squared minus 2 x minus 4 is equal to negative 3 x plus 9 ?

Answer
A
the x -coordinates of the x -intercepts of the graphs of y is equal to x squared minus 2 x minus 4 and y is equal to negative 3 x plus 9
B
the x -coordinates of the intersection points of the graphs of y is equal to x squared minus 2 x minus 4 and y is equal to negative 3 x plus 9
C
the y -coordinates of the intersection points of the graphs of y is equal to x squared minus 2 x minus 4 and y is equal to negative 3 x plus 9
D
the y -coordinates of the y -intercepts of the graphs of y is equal to x squared minus 2 x minus 4 and y is equal to negative 3 x plus 9

Explanation

The solutions are the x-values that make the two sides equal, so they occur where the graphs y = x² − 2x − 4 and y = −3x + 9 intersect. Setting the expressions equal gives x² + x − 13 = 0, whose solutions are x = (−1 + √53)/2 and x = (−1 − √53)/2. These are the x-coordinates of the intersection points, as choice B states.

AI-written and checked against the verified answer.

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