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Verified answer
a. y = -1/2 x + 6
gradiennya m1 = -1/2
syarat tegak lurus
m1 . m2 = -1
-1/2 . m2 = -1
m2 = 2
pers. garis melalui (2,5) dan gradien 2
y - 5 = 2(x - 2)
y - 5 = 2x - 4
y = 2x - 4 + 5
y = 2x + 1
atau dapat ditulis
2x - y + 1 = 0
b. 3x = -4y + 5
4y = -3x + 5
y = -3x/4 + 5/4
gradien garisnya -> m1 = -3/4
syarat tegak luruss
m1 . m2 = -1
-3/4 . m2 = -1
m2 = 4/3
pers. garis melalui (2,5) dan gradien 4/3
y - 5 = 4/3(x - 2)
y - 5 = 4x/3 - 8/3
y = 4x/3 - 8/3 + 15/3
y = 4x/3 + 7/3
atau dapat ditulis
3y = 4x + 7
4x - 3y + 7 = 0