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2) f(x) = ax + bf(3) = 3a + b = 2
f(-2) = - 2a + b = - 8
-----------------------------(-)
5a = 10
a = 2
subtitusi
3a + b = 2
3(2) + b = 2
6 + b = 2
b = 2 - 6
b = - 4
rumus fungsi
f(x) = 2x - 4
3) 4x - 3y = 12
- 3y = - 4x + 12
m = -4/-3
m = 4/3
gradien saling tegak lurus
m1 . m2 = - 1
4/3 . m2 = - 1
m2 = - ¾
4) y = - 4/3x - 7
m = - 4/3
sejajar m1 = m2 = - 4/3
pers garis
y - y1 = m ( x - x1 )
y - 7 = - 4/3 ( x - 0 )
y = - 4/3 x + 7 ( dikali 7 )
7y = - 4x + 49
7y + 4x = 49