Escreva a função afim f(x)= ax+b sabendo que:
A) f(1)= 5 e f(-3)= -7
B) f(-1) = 7 e f(2)= 1
A) f(1)= 5 e f(-3)= -7
B) f(-1) = 7 e f(2)= 1
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Bom diaa)
f(1) = 5
f(-3) = -7
f(1) = a + b = 5
f(-3) = -3a + b = -7
a + 3a = 5 + 7
4a = 12
a = 3
3 + b = 5
b = 2
f(x) = 3x + 2
b)
f(-1) = 7
f(2) = 1
f(-1) = -a + b = 7
f(2) = 2a + b = 1
2a + a = 1 - 7
3a = -6
a = -2
2 + b = 7
b = 5
f(x) = -2x + 5