Răspuns:
Explicație pas cu pas:
1. f(x)=2x/3-5
x=0 f(x)=-5 A(0;-5)
0=2x/3-5 2x/3=5 2x=15 x=7,5 B(7,5;0)
2. f(x)=-6x+9
M(a,-33)
-33=-6a+9 -42=-6a a=7 M(7,-33)
3. S(3,-1) si T (-1,-9)
y=ax+b
-1=3a+b -1=3a+b
-9=-a+b 9=a-b
.....................
8=4a a=2 9=2-b b=-9+2=-7
y=2x-7
4. f(x)=2,5x-√10 M(3√10, b) M(3√10;6,5√10)
b=25/10×3√10-√10=15√10/2-√10=13√10/2
