AlgebraEasy–MediumX-intercept from a slope and a point
Algebra practice question
A line in the xy-plane has slope −4 and passes through the point (2, 3). What is the x-coordinate of the point where the line crosses the x-axis?
Answer: 11/4 or 2.75
The line is y = −4x + 11. Setting y = 0 gives x = 11/4.
Common wrong answers
- If you answered 11
- 11 is the y-intercept.
- If you answered -11/4
- −11/4 has the sign wrong.
- If you answered 3/4
- 3/4 divides 3 by 4 instead of 11 by 4.
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