F4 math (急!!) 15point !
2010-09-19 9:51 pm
In each of the following, find the equation of the straight line L2 passing through P(2,4) and perpendicular to L1: 4x-3y-7=0
回答 (1)
2010-09-19 10:02 pm
✔ 最佳答案
Slope of L1 = -4/(-3) = 4/3L1 ⊥ L2
Slope of L1 x Slope of L2 = -1
4/3 x Slope of L2 = -1
Slope of L2 = -3/4
The equation of L2:
y - 4 = -3/4(x-2)
y = -3x/4 + 11/5
2010-09-19 14:03:54 補充：
Last line should be
y = -3x/4 + 11/2
Sorry!
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