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  4. If the slope of the line joining the points (3, 4) and (-2, a) is equal to -(2/5), then the value of a is equal to

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Q. If the slope of the line joining the points (3,4) and (−2,a) is equal to −25, then the value of a is equal to

KEAMKEAM 2012Straight Lines

Solution:

According to the given conditions
a−4−2−3=−25
a−4−5=−25
a−4=2⇒a=6