Answer:
90,60
Step-by-step explanation:
its the only point the line crosses on the graph
<u>Given:</u>
The given function is 
We need to determine the reflection of f(x) over the x - axis
<u>Reflection over x - axis:</u>
The translation rule to reflect over the x - axis is given by
Thus, applying the rule, the function becomes
Multiplying both sides of the equation by -1, we have;
This can be written as
Hence, the reflection of the function over the x - axis is
Thus, Option A is the correct answer.
Answer:
use a caculater
Step-by-step explanation:
Answer:
<em>The sister's age is 8 and the brother's age is 4</em>
Step-by-step explanation:
Let's make:
x = age of the brother
y = age of the sister
x - 2 = age of the brother two years ago
y - 2 = age of the sister two years ago
Two years ago, the age of the sister was three times greater than the age of the brother:
y - 2 = 3(x - 2)
Now, the relation doubles:
y = 2x
Substituting in the first equation:
2x - 2 = 3(x - 2)
Operating:
2x - 2 = 3x - 6
Subtracting 3x -2:
2x - 3x = 2 - 6 = -4
Solving:
x = 4
y =2x = 8
The sister's age is 8 and the brother's age is 4
