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If the line passing through the points (a, 1) and (−17, 8) is parallel to the line passing through the points (0, 5) and (a + 2, 1), what is the value of a?
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If the line passing through the points (a, 1) and (−17, 8) is parallel to the line passing through the points (0, 5) and (a + 2, 1), what is the value of a?

User Jitendra Ahuja
by
8.3k points

1 Answer

4 votes
parallel line means the same slope
（8-1）/(-17-a)=(1-5)/(a+2)
so a is 18
User Akarsakov
by
8.2k points
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