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The line (y=-12x+c) has (y)-intercept (9). What will (y) be at (x=-4)?

Answer and explanation

Correct answer: 57

The y-intercept is the value of y when x=0. Therefore, in y=-12x+c, we have c=9. Substituting x=-4 gives y=-12(-4)+9=48+9=57. The value 48 is only the product -12×(-4); the y-intercept 9 must also be added. Exam tip: in y=mx+c, the y-intercept is c.

Related tags

Linear EquationsY-InterceptSubstitutionCoordinate GeometryNegative IntegersSlope And Y InterceptIntroduction To PolynomialsMathematics

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