Find the domain of f/x)=7x/x-3 need

The domain of this function is all real numbers such that x does not equal 3.

We can tell this by looking at the equation for one of two things. The two things that typically disrupt a domain are dividing by zero and taking a square root of a negative. Since there are no square roots, we are only concerned with dividing by zero. So, we take the denominator and set it equal to 0.

x - 3 = 0

x = 3

This means that 3 is the value that makes the denominator 0 and therefor is the only x value we cannot use.

x + 2(2x-4) = 10

Step-by-step explanation:

Here in this question, we want to select which is the correct answer if we substitute for the value of y in the second equation, using the first.

In the first, we have;

y = 2x -4

Now, let’s input this value of y into the second equation.

By direct substitution, what we have is the following;

x + 2y = 10

—-> x + 2(2x -4) = 10