Answer:
the group bought 10 burger and 12 drinks
Step-by-step explanation:
6.25×10=62.5
92.50-62.5=30
30÷2.50=12
Answer:
10
Step-by-step explanation:
f(x) = 3x + 1
f^-1 = x-1/3 , it is known as inverse function.
f(3)= 3*3 +1
=9+1
=10
To find inverse,
x=3x + 1
y=3x+1
Exchanging the position or x and y
x=3y+1
x-1=3y
.•. y=x-1/3
Y=2x+1
2x-y=2
2x-(2x+1)=2
-1=2
-1+1=2+1
0=3
No solution