Suatu fungsi dirumuskan dg f(x)=ax+b jika f(-2)=14dan f(3)=-1, maka nilai f(7)- f(10) adalah…

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F(x) = ax + b
f(-2)= -2a + b = 14
f(3) = 3a + b = – 1
______________ –
– 5a = 15
a = 15/-5 = -3
3a + b = -1
3(-3) + b = -1
-9 + b = – 1
b = -1+9
b = 8
f(x) = ax + b = -3x +8
f(7) – f(10) = [ -3 (7) + 8] – [ -3 (10) +8 ]
= -21 +8 +30 -8
= 9