Diketahui f(x)=ax+b.jika f(-3)=-4 dan f(4)=17.maka nilai f(10) adalah

Kelas 8 Matematika
Bab Fungsi

f(x) = ax + b

f(-3) = -3a + b = -4
f(4) = 4a + b = 17

  4a + b = 17
-3a + b = -4
----------------- -
7a = 21
a = 3

4a + b = 17
4 . 3 + b = 17
b = 17 - 12
b = 5

f(x) = 3x + 5

f(10) = 3 . 10 + 5
f(10) = 35

f(x) = ax + b
f(-3) = -3a + b = -4
f(4) = 4a + b = 17
.........------------------- -
-7a = -21
a = -21/-7
a = 3

4a + b = 17
4(3) + b = 17
12 + b = 17
b = 17 - 12
b = 5

f(x) = 3x + 5
f(10) = 3(10) + 5
f(10) = 30 + 5
f(10) = 35