fungsi dinyatakan dengen rumus g(x)=a×+b.jika g(-2)=-4 dan g(3)=21,maka g(7)

g(-2) = a(-2)+b = -4
g(3) = a(3)+b = 21

-2a+b = -4
3a+b = 21
————— -
-5a = -25
a = 5
...
-2(5)+b = -4
-10+b = -4
b = 6

g(7) = 5(7) + 6 = 35+6 = 41

Jadikan terbaik ya..

Kelas 8 Matematika
Bab Fungsi

g(x) = ax + b

g(-2) = -2a + b = -4
g(3) = 3a + b = 21

3a + b = 21
-2a + b = -4
----------------- -
5a = 25
a = 5

3a + b = 21
3 . 5 + b = 21
b = 21 - 15
b = 6

g(x) = 5x + 6

g(7) = 5 . 7 + 6
g(7) = 35 + 6
g(7) = 41