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= ax - b
f(-1) = -a - b = 13
f(2) = 2a - b = 13
----------------------- +
a = 26
substitusikan a ke persamaan 1
-a -b = 13
-26 - b = 13
-b = 13 + 26
-b = 39
b = -39
RUMUS FUNGSI
ax = b
26x = - 39