Diketahui fungsi f dengan rumus f(x) = ax + b. Jika f(5) = 13 dan f(-2) = -8, maka tentukan nilai a dan b! * Tolong jawab secepatnya karena dikumpulin besok*

f(x) = ax+b
f(5)= a(5) + b = 13
= 5a+b= 13
f(-2) = a(-2) + b = -8
= -2a+b = -8

5a + b =13
-2a + b = -8
                    -
7a = 21
a=3

-2a+ b= -8
-2 (3) +b = -8
-6 +b= -8
b= -2

1. f(5) → a.5 + b = 13
→ 5a + b = 13

2.f(-2) → a.-2 + b = -8
→ -2a + b = -8

eleminasi
5a + b = 13
-2a + b = -8
________ -
7a = 21
a = 21/7
= 3

subst. a=3 ke

5a + b = 13
5.3 + b = 13
b = 13 - 15
b = -2

bner ngga kk??