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Select THREE equations whose graphs are straight lines

Select THREE equations whose graphs are straight lines-example-1

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Answer:

A, C and D

Explanation:

A: y = 7 is a straight, horizontal line

B: is a parabola. Discard

C: (cannot read denominator) This is a straight line thru the origin.

D: This is a straight line.

E: This is a parabola, due to to the x^2 term. Discard

F: This is a circle. Discard

Straight lines here are A, C and D

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