14-4x=2y
divide both sides by 2
7-2x=y
subsitute 7-2x for y
7-2x+2x=7
add like terms
7=7
true
therefor these 2 equations are the same and there are an infinite number of equations
answer is C
ANSWER

or

We have

Since we cannot factor easily, we complete the square.
Adding 2 to both sides give,

Dividing through by 3 gives

Adding

to both sides gives

The expression on the Left Hand side is a perfect square.




Splitting the plus or minus sign gives

or
Answer:
e^2 -7 = x
Step-by-step explanation:
2=ln(x+7)
Raise each side to the base of e
e^2 = e^ln (x+7)
The e^ln cancel
e^2 = x+7
Subtract 7 from each side
e^2 -7 = x +7-7
e^2 -7 = x
When you solve the following equation, solving for the quadratic formula.
The answer is; x=4
Next time pay attention in class.