Solve using substitution. 2x-y=4 x=3 square square D

To solve the system of equations using substitution, we will follow these steps:

1. Solve one of the equations for one variable in terms of the other variable.
2. Substitute the expression for the variable into the other equation and solve for the remaining variable.
3. Substitute the value of the variable found in step 2 back into one of the original equations to find the value of the other variable.

Given the system of equations:
$$2x - y = 4$$
$$x = 3$$

Step 1: The second equation is already solved for $x$:
$$x = 3$$

Step 2: Substitute $x = 3$ into the first equation:
$$2(3) - y = 4$$
$$6 - y = 4$$

Now solve for $y$:
$$-y = 4 - 6$$
$$-y = -2$$
$$y = 2$$

Step 3: Substitute $y = 2$ back into the second equation to verify:
$$x = 3$$

So the solution to the system of equations is:
$$x = 3$$
$$y = 2$$

Therefore, the solution is:
$$\boxed{3} \quad \boxed{2}$$