Question

fie f: R , f(x)=5x-7
Aflam m apartine R daca
a) A ( 1; m+1) apartine Gf
b) B (m; 5) apartine Gf
c) C (m; 3m+5) apartine Gf
d) D ( 3m; m+3) apartine Gf

Answer 1

a. f(1)=m+1

5-7=m+1

m=-3

b. f(m)=5

5m-7=5

5m=12

$m=\frac{12}{5}$

c. f(m)=3m+5

5m-7=3m+5

2m=12

m=6

d. f(3m)=m+3

15m-7=m+3

14m=10

7m=5

$m=\frac{5}{7}$