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If (y=mx-1) passes through ( (2,7) ), what is (m)?
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Answer and explanation
Correct answer: 4
Substituting the point (2,7) into y=mx-1 gives 7=2m-1. Therefore, 2m=8 and m=4. If m=3, then y=2(3)-1=5, not 7. Exam tip: To find an unknown parameter in a line, substitute the coordinates of the given point into its equation.
Frequently asked questions
What is the correct answer to this question?
4
Why is this the correct answer?
Substituting the point (2,7) into y=mx-1 gives 7=2m-1. Therefore, 2m=8 and m=4. If m=3, then y=2(3)-1=5, not 7. Exam tip: To find an unknown parameter in a line, substitute the coordinates of the given point into its equation.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Slope and y-intercept.
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