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If (ay=12x-18) has slope (4), what is the value of (a)?

Answer and explanation

Correct answer: (3)

The answer is option C, 3. The slope is the coefficient of x after the equation is written in the form y=mx+c. Starting with ay=12x-18, divide every term by a: y=(12/a)x-18/a. Therefore the slope m is 12/a. The question says the slope is 4, so 12/a=4. Multiplying by a gives 12=4a, and dividing by 4 gives a=3. Option A, 2, would give slope 12/2=6, so it is wrong. Option B, 4, would give slope 12/4=3, so it is also wrong. Option C, 3, gives slope 12/3=4, exactly as required. Option D, 6, would give slope 12/6=2. Thus C is correct. Remember: first isolate y; then the coefficient of x is the slope.

Related tags

Parameter SlopeRearrange EquationHard

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