Answer:
Option C 
Step-by-step explanation:
<u><em>Verify each expression</em></u>
case A) we have

In this expression the term of n is 6n
so
has a coefficient of positive 6
case B) we have

In this expression the term of n is -5n
so
has a coefficient of negative 5
case C) we have

In this expression the term of n is n
so
has a coefficient of positive 1
case D) we have

In this expression the term of n is -n
so
has a coefficient of negative 1
If the bases are the same then you can let the exponents be equal to each other. If the exponents are not the same then you will have to use logarithms to solve for x.
From the equation, we have

To find the vertex and focus, we have to use the following formula

And

So, we have


Answer:
x = 5
y = -4/3
Step-by-step explanation:
2x + 3y = 6
x - 3y = 9
Substitution Method:
x = 3y + 9
2(3y+9) + 3y = 6
6y + 18 + 3y = 6
9y = -12
y = -12/9 or -4/3
x - 3(-4/3) = 9
x + 4 = 9
x = 5