Question

Mohon bantuanya untuk nomor 7 dan caranya makasih

Answer 1

Persamaan garis AB = x/4a + y/3b = 1
titik A = (-12, 0) → (x1, y1)
titik B = (0, 9) → (x2, y2)
a × b = ?

masukkan titik A dan B ke persamaan garis AB,

titik A :
x1/4a + y1/3b = 1
(-12)/4a + (0)/3b = 1
-3/a + 0 = 1
-3/a = 1
-3 = 1 × a
-3 = a

titik B :
x2/4a + y2/3b = 1
(0)/4a + (9)/3b = 1
0 + 3/b = 1
3/b = 1
3 = 1 × b
3 = b

a × b = -3 × 3 = -9

maaf kalau salah
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