You already have one of the two answer(s) selected... (C). The other answer is E, because (27/9) = 3, then you add x. As letter C, the answer is 3x.
Algebra form: y1 - y2, and x1 - x2.
( 2 - 1 ) ( 6 - 3 ).
= 1/3.
slope = 1/3.
Answer:

Step-by-step explanation:

Add 7 to both sides:
Multiply both sides by -1:
Divide both sides by 5:
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<span>When price falls quantity demanded will rise, but for simplicity economists take the absolute value of the elasticity number.</span>