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14=2a+b ....(1)
f(4)= ax+b
22= 4a+b...(2)
Persamaan (2)-(1)
2a=8
a=4
Masukkan a=4 ke (1)
14=2a+b
14=2.4+b
14=8+b
14-8=b
6=b
b=6
Maka:
f(19)=ax+b
=4x+6
=4.19+6
=76+6
=82
Jadi jawabannya 82.000