AlgebraHardConstant from an x-intercept
Algebra practice question
In the xy-plane, the line 3x − 4y = c has an x-intercept of 3, where c is a constant. What is the y-intercept of the line?
Answer: -9/4 or -2.25
At (3, 0), c = 9; then at x = 0, −4y = 9 gives y = −9/4.
Common wrong answers
- If you answered 3
- 3 is the x-intercept.
- If you answered 9
- 9 is c.
- If you answered 9/4
- 9/4 loses the sign.
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