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Verified answer
Pake perbandingan gradien m = (y2 - y1)/(x2 - x1)(2, 7), (-1, -2) dan (a, 10)
(-2 -7)/(-1 - 2) = (10 + 2)/(a + 1)
3 = 12/(a + 1)
a + 1 = 12/3
a = 3
Verified answer
Kelas 8Matematika
Bab 3 - Persamaan Garis
menentukan nilai a
(yL - yK) ÷ (xL - xK) = (yM - yL) ÷ (xM - xL)
(-2 - 7) ÷ (-1 - 2) = (10 - (-2)) ÷ (a - (-1))
(-9) ÷ (-3) = 12 ÷ (a + 1)
3 = 12 ÷ (a + 1)
(a + 1) = 12 ÷ 3
a + 1 = 4
a = 4 - 1
a = 3
ilustrasi bisa dilihat di lampiran