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4a + b = 6 (dikurang)
2a = 14
a = 14/2
a = 7
substitusikan nilai a=7
4a + b = 6
4(7)+b= 6
28 +b = 6
b = 6 - 28
b = -22
maka bentuk fungsi= f(x):ax + b⇒f(x): 7x - 22