Răspuns:
Explicație pas cu pas:
f(x) = 2x + 3
f(2) = 2*2 + 3 = 4 + 3 = 7
_______________
E(2; 5)
abscisa = 2
_______________
f(x) = ax + 2
A(4; 6)
a*4 + 2 = 6
a*4 = 6 - 2 = 4
a = 4: 4 = 1
________________
f(x) = 4x + b
B(2; 10)
4*2 +b = 10
8 + b = 10
b = 10 - 8 = 2
__________________
f(x) = 3x + 2
C(c; 11)
3c + 2 = 11
3c = 11 - 2 = 9
c = 9 : 3 = 3
________________
D(3; -1)
f(3) = -1
_______________
f(x) = 5x + 3
f(x) = 8
5x + 3 = 8
5x = 8 - 3 = 5
x = 5 : 5 = 1
