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2/3a - 8/3 = -2
2/3a = 3/4
a = 2
15) g = x - y = 7 = x - 7 = y
m1 = 1
m1 × m2 = -1
1 × m2 = -1
m2 = -1
l = y - (-2) = -1 × (x - 1)
y + 2 = -1x + 1
y = -x - 1
y + x + 1 = 0
16) f(4) = 4a + b = 19
f(2) = 2a + b = 7
------------------------------ ---
2a = 12
a = 6
2(6) + b = 7
12 + b = 7
b = -5
f(x) = 6x - 5
17) 5x = Rp 2.500.000
5x > 4y
Jadi, jawabannya C
18) 6x + 2y -12 = 0
6x -12 = -2y
-------------------- : (-2)
-3x + 6 = y
m = -3
y - 4 = -3 (x + 4)
y - 4 = -3x -12
y = -3x -8
y + 3x + 8 = 0 (ga ada pilihab jawabannya)
maaf ya kalo ada yang salah. semoga berguna