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f (-1) = -1m + n = 1. dikurangi
= 1m = 3
m = 3/1 = 3
-1m + n = 1
-1(3) + n = 1
-3 + n =1
n = 1+3
n = 4
maka
f(-3) = -3(3) + 4
= -9 + 4
= -5
3.) m = -a/b
m = -2/-3 = 2/3
y-y1 = m (x-x1)
y+3. = 2/3 ( x-2)
3y + 9 = 2x-4
3y - 2x = -4-9
3y - 2x = -13
3y - 2x + 13 = 0