16Hit1600
Advanced MathMediumSolving a line-parabola system

Advanced Math practice question

If (x, y) is a solution to the system y = x² and y = 4x − 3, and x > 2, what is the value of y?

Answer: 9

x² = 4x − 3 gives x² − 4x + 3 = 0, so x = 1 or x = 3. Since x > 2, x = 3 and y = 9.

Common wrong answers

If you answered 1
1 is the rejected value of x, and its y-value.
If you answered 3
3 is x, not y.
If you answered 4
4 is the sum of the two x-values.

More Advanced Math questions

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