If the line passing through the points (1, a) and (3, - 2) is parallel to the line passing through the points (3, 7) and (- 5, a + 6) , what is the value of a?
a. a = - 3
b. a = 5
c. a = - 5
d. a = 3
a. a = - 3
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A.
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C.
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B. gallon
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What will be an ideal response?