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If in (y=(a-7)x+a), the difference between slope and (y)-intercept is (-7), which statement is correct?

Answer and explanation

Correct answer: It is true for every (a)

In the standard form (y=mx+c), (m) is the slope and (c) is the y-intercept. Here, the slope is (a-7) and the y-intercept is (a). Their difference is (a-7)-a=-7, so the terms containing (a) cancel. Hence, the condition is true for every value of (a). Substituting (a=7) merely makes the slope 0; it does not make the condition true only for that value. Exam tip: Compare the equation with (y=mx+c) first, identify (m) and (c), and then calculate the required difference.

Related tags

Slope And InterceptLinear EquationsParameterAlgebraic IdentityCoordinate GeometrySlope And Y InterceptIntroduction To PolynomialsMathematics

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