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If (y=5x+b) and (y=-3x+6) cut the (y)-axis at the same point, what is (b)?

Answer and explanation

Correct answer: 6

To find a line’s y-intercept, put x=0. For the first line, y=b, while for the second line, y=6. Since both lines meet the y-axis at the same point, their y-intercepts must be equal. Hence, b=6. The number 5 is the slope of the first line, not its y-intercept. Exam tip: always set x=0 to find the y-intercept.

Related tags

Linear EquationsY-InterceptSlopeCoordinate GeometryParameter ComparisonSlope And Y InterceptIntroduction To PolynomialsMathematics

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