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Verified answer
Garis 2x - y + 3 = 0 memiliki gradienm1 = -2/-1
m1 = 2
syarat tegak lurus
m1 . m2 = -1
2 . m2 = -1
m2 = -1/2
pers. garis yang melalui (-4,5) dan gradien -1/2 adalah
y - 5 = -1/2 (x + 4)
y - 5 = -x/2 - 4/2
y = -x/2 - 4/2 + 10/2
y = -x/2 + 6/2
2y = -x + 6
x + 2y - 6 = 0
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titik (-8,n) terletak pada garis 4y = - 3x + 60
subtitusikan (-8,n) ke pers. garisnya
4y = - 3x + 60
4n = - 3(-8) + 60
4n = 24 + 60
4n = 84
n = 84/4
n = 21