Question

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Answer 1

1)

f(x) =ax+b

f(2)=a.(2)+b

2a+b=7

f(5)=5a+b

5a+b=13

{2a+b=7×(-1)

{5a+b=13

{–2a–b=–7

+ {5a+b=13

$3a = 6 \\ a = \frac{6}{3} \\ a = 2$

$2a + b = 7 \\ 2.2 + b = 7 \\ 4 + b = 7 \\ b = 7 - 4 \\ b = 3$

f(x)=2x+3

quando x=–1

f(–1)=2.(–1)+3

f(–1)=–2+3

f(–1)=1

2) f(x) =3x+2

f(x) =5

x=?

3x+2=5

3x=5–2

3x=3

$<strong>x = \frac{3}{3} \\ x = 1</strong>$

Answer 2

Resposta:

Explicação passo-a-passo: