AlgebraEasy–MediumWhere a line crosses the x-axis
Algebra practice question
In the xy-plane, the line y = −3x + 12 crosses the x-axis at what value of x?
Answer: 4
Set y = 0: −3x + 12 = 0 gives x = 4.
Common wrong answers
- If you answered 12
- 12 is the y-intercept.
- If you answered -4
- −4 has the sign wrong.
- If you answered -3
- −3 is the slope.
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