AlgebraMediumSum of a line's intercepts
Algebra practice question
For the line 5x − 2y = 20 in the xy-plane, what is the sum of the x-intercept and the y-intercept?
Answer: -6
The x-intercept is 20/5 = 4 and the y-intercept is 20/(−2) = −10, so the sum is −6.
Common wrong answers
- If you answered 4
- 4 is the x-intercept alone.
- If you answered 14
- 14 uses a y-intercept of 10, losing the sign.
- If you answered -4
- −4 subtracts the wrong way.
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- Medium
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