16Hit1600
Advanced MathMediumSum of the values of a linked variable

Advanced Math practice question

If x² − 5x + 6 = 0 and y = x + 1, what is the sum of all possible values of y?

Answer: 7

x² − 5x + 6 = (x − 2)(x − 3), so x = 2 or 3, giving y = 3 or 4. The sum is 7.

Common wrong answers

If you answered 5
5 is the sum of the x-values.
If you answered 6
6 is the product of the x-values.
If you answered 12
12 is the product of the y-values.

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