Diketahui f(x) = ax + b, jika f(-3) = -16 dan f(4) = -2, maka tentukan nilai a dan b serta nilai f(-7) dan f(9)​

– 3a + b = – 16

– 2a + b = – 2

____________ –

– a = – 14

a = 14

– 2a + b = – 2

– 2 ( 14 ) + b = – 2

– 28 + b = – 2

b = 26

f( – 7)

= 14 ( – 7 ) + 26

= – 98 + 26

= – 72

f(9)

= 14 ( 9 ) + 26

= 126 + 26

= 152