Question

Diketahui rumus fungsi f(x) = ax+b. jika f(3) =15 dan f(-2)= 10.tentukanlah
a. nilai a dan b
b. rumus fungsi f(x)
c. nilai f(7)
mohon bantuannya yaa

Answer 1

A.)3a+b=15,b=15-3a disubstitusikan ke
-2a+b=10
-2a+15-3a=10
-5a=-5
a=1
b=15-3.1=12
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b.)f(x)=(1)x+12
f(x)=x+12
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c.)f(7)=7+12=19

Answer 2

F(x) = ax + b

f(3) = 3a + b =15
f(-2) = -2a + b = 10
dikurangi 
5a = 5
a = 1

f(3) = 3.1 + b = 15
b = 15-3
b = 12

f(x) = 1x + 12

f(7) = 7 + 12
f(7) = 19