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If 2y = (a - 4)x + 16 has slope 3, what will a be?

Answer and explanation

Correct answer: 10

The governing concept is identifying slope after converting an equation to y = mx + c. Divide every term of 2y = (a - 4)x + 16 by 2: y = ((a - 4)/2)x + 8. Hence the coefficient of x, and therefore the slope, is (a - 4)/2. The given slope is 3, so (a - 4)/2 = 3. Multiplying both sides by 2 gives a - 4 = 6, and adding 4 gives a = 10. Thus option B is correct. Option A would result from mishandling the subtraction, while options C and D do not satisfy the equation. A frequent error is to call a - 4 the slope before dividing the entire equation by 2; the coefficient must be read only after y has been isolated.

Related tags

Parameter-SlopeSlope-InterceptRearrangementLinear-EquationsSlope Intercept FormLinear Equations In Two VariablesMathematicsClass 9 Mcq

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