AlgebraMediumy-axis crossing of a line given with x in terms of y
Algebra practice question
In the xy-plane, the graph of x = 2y + 6 is a line. At what y-coordinate does the line cross the y-axis?
Answer: -3
On the y-axis, x = 0: 0 = 2y + 6 → y = −3.
Common wrong answers
- If you answered 3
- 3 has the wrong sign.
- If you answered 6
- 6 is where the line crosses the x-axis (y = 0), not the y-axis.
- If you answered -6
- −6 comes from reading the constant as the y-intercept, which only works when y is the subject.
More Algebra questions
- Medium
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If y = 2x − 1 and 3x + y = 14, what is the value of x? - Medium
If |2x − 3| = 7, what is the sum of all possible values of x? - Medium
Line k has equation y = (2/3)x + 1. Which equation represents a line perpendicular to line k?
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