Question

1. Diketahui f(x)=a+bx. Jika f(6)=-13,dan f(-2)=11, maka nilai a+b adalah....
2. Diketahui f(x)=4x-3. Jika f(a)=1 dan f(2)=b, maka nilai a+b adalah....
tolong ya pakai caranya..

Answer 1

F(x) = a + bx
f(6) = a + b(6)
= a + 6b
a + 6b = -13

f(-2) = a + b(-2)
= a - 2b
a - 2b = 11

a + 6b = -13
a - 2b = 11__-
8b = -24
b = -24/8
b = -3

a + 6b = -13
a + 6(-3) = -13
a - 18 = -13
a = -13 + 18
a = 5

a + b = 5 + (-3)
= 2

===============

f(x) = 4x - 3
f(a) = 4a - 3

4a - 3 = 1
4a = 1 + 3
4a = 4
a = 4/4
a = 1

f(2) = 4(2) - 3
= 8 - 3
= 5

b = 5

a + b = 1 + 5
= 6