Question

determinati funtia de gradul 1 stiind ca f(1)=2 si f(-2)=-7

Answer 1

f(x)=ax+b
f(1)=a+b=2
f(-7)=-7a+b=-7 |×(-1) => 7a-b=7 => b= 7a-7
a+b=2 => a+7a-7=2 => 8a=9 => a=1,12
b=0,88
f(x)=1,12x+0,88