AlgebraMediumCoefficient from a y-intercept
Algebra practice question
In the xy-plane, the graph of 2x + by = 10, where b is a constant, has a y-intercept of −5. What is the value of b?
Answer: -2
At the y-intercept x = 0, so b(−5) = 10 and b = −2.
Common wrong answers
- If you answered 2
- 2 has the sign wrong.
- If you answered 5
- 5 divides 10 by 2 and ignores the sign.
- If you answered -50
- −50 multiplies 10 by −5.
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