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If (m=-3) and (3c+m=18) in (y=mx+c), what is the (y)-intercept?

Answer and explanation

Correct answer: 7

In the form (y=mx+c), the y-intercept is c. Substituting m=-3 into 3c+m=18 gives 3c-3=18. Hence, 3c=21 and c=7. Therefore, the y-intercept is 7. Option 6 may result from incorrectly ignoring the -3 term. Exam tip: to find the y-intercept, determine the value of c.

Related tags

Linear EquationsSlope Intercept FormY-InterceptSubstitutionAlgebraSlope And Y InterceptIntroduction To PolynomialsMathematics

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