Maka nilai a+b adalah.......?

f(x)=ax+b
f(-2)=-17
f(5) = 32

f(-2)=a(-2)+b =-2a+b=-7...pers(1)
f(5) =a(5)+b =5a+b =32 ..... pers(2)


eliminasi b ,,,, -2a+b=-17
eliminasi b ,,,, 5a+b=32
dikurang kan. -7a. = -49
a=-49/-7 = 7

subsitusi ke pers (1).
f(-2)= -2a+b = -2(7) + b
=-14+b = -17
b. = -17 +14 = -3


nilai a= 7 _,, nilai b = -3
jadi a+b = 7+(-3) = 7-3=4

=>
= -2 a + b = -17
= 5 a + b = 32
--------------------- -
= -7 a + 0 = -49
= a = -49 : -7
= a = 7

=>
= -2 a + b = -17
= -2 . 7 + b = -17
= -14 + b = -17
= b = -17 - (-14)
= b = -3

=>
= a + b
= 7 + (-3)
= 4 (D)

Jadi, nilai a + b adalah 4

smga membantu :)