84323
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Solving Linear-Quadratic Systems

Question 84323 • FL-1200330-Algebra 2 CR

Jordan is solving this system of equations: y = 2x2 + 3 and y – x = 6. Which statements are true about Jordan’s system? Check all that apply.

Answer
A
The quadratic equation is in standard form.
B
Using substitution, the system of equations can be rewritten as 2x2 – x – 3 = 0.
C
There are two real number solutions.
D
There are no real number solutions.
E
A solution of the system of equations is (–1, 1.5).

Explanation

The quadratic is in standard form, y = ax² + bx + c, with a = 2, b = 0, and c = 3, so A is true. Substituting y = x + 6 from the second equation into the first gives 2x² + 3 = x + 6, or 2x² − x − 3 = 0, so B is true. This quadratic has discriminant (−1)² − 4(2)(−3) = 25, which is positive, so there are two real solutions and C is true. For x = −1, y = 5, not 1.5, so E is false.

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