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m = (y2 - y1) / (x2 - x1)
1/2 = (p - 3) / (2 - (-2))
1/2 = (p - 3) / (2 + 2)
1/2 = (p - 3) / 4
2(p - 3) = 4
2p - 6 = 4
2p = 4 + 6
2p = 10
p = 10/2
p = 5
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gunakan persamaan garis :
(y - y1) / (y2 - y1) = (x - x1) / (x2 - x1)
(y - h) / (7 - h) = (x - 4) / (h + 3 - 4)
(y - h) / (7 - h) = (x - 4) / (h - 1)
(h - 1)(y - h) = (7 - h)(x - 4)
hy - h² - y + h = 7x - 28 - hx + 4h
hy - y - h² + h = 7x - hx - 28 + 4h
hy - y = (7 - h)x - 28 + 4h - h + h²
(h - 1)y = (7 - h)x - 28 + 3h + h²
y = ((7 - h)x - 28 + 3h + h²) / (h - 1)
ingat bahwa : y = mx + c
maka, ambil yang merupakan koefisien yang mengikuti variabel x saja.
(7 - h) / (h - 1) = -1/4
-(h - 1) = 4(7 - h)
1 - h = 28 - 4h
4h - h = 28 - 1
3h = 27
h = 27/3
h = 9