SOLUTION: Find the value of k for which the segment with endpoints (2.1, 3.3) and (k, −3.2) is parallel to the segment with endpoints (−1, −2) and (1, 3).

Algebra ->  Length-and-distance -> SOLUTION: Find the value of k for which the segment with endpoints (2.1, 3.3) and (k, −3.2) is parallel to the segment with endpoints (−1, −2) and (1, 3).       Log On


   



Question 1124695: Find the value of k for which the segment with endpoints (2.1, 3.3) and (k, −3.2) is parallel to the segment with endpoints (−1, −2) and (1, 3).

Found 2 solutions by Boreal, josmiceli:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
parallel lines have the same slope, and the segment has a slop of 5/2
the other line has a change of y of -6.5 (from right to left). The change in x has to be -2.6. That would make x be -0.5.
equations of both lines
y-3=2.5(x-1) or y=2.5x+0.5
y-3.3=2.5(x-2.1) or y=2.5x-1.95
graph%28300%2C300%2C-10%2C10%2C-10%2C10%2C2.5x%2B0.5%2C2.5x-1.95%29

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
( 2.1, 3.3 ) and ( k, -3.2 )
( -1, -2 ) and ( 1, 3 )
覧覧覧覧覧覧覧
Make the 2 slopes equal
+%28+3.3+-%28-3.2%29+%29+%2F+%28+2.1+-+k+%29+=+%28+3+-%28-2%29+%29+%2F+%28+1+-%28-1%29+%29+
+6.5+%2F+%28+2.1+-+k+%29+=+5+%2F+2+
Multiply both sides by +2%2A%28+2.1+-+k+%29+
+2%2A6.5+=+5%2A%28+2.1+-+k+%29+
+13+=+10.5+-+5k+
+5k+=+-+2.5+
+k+=+-.5+
覧覧覧覧覧-
Check:
+6.5+%2F+%28+2.1+-%28-.5%29+%29+=+2.5++
+6.5+%2F+2.6+=+2.5+
+2.5+=+2.5+