For this case we have the following system of equations:

To solve, we clear "x" from the second equation:

We substitute "x" in the first equation:

We clear the value of the variable "y":

We look for the value of the variable "x":

Thus, the solution of the system is given by:

Answer:

Option D
Answer:
x=0
Step-by-step explanation:
The line x=4 is a vertical line through the x-axis at 4. A line parallel to it will also be a line through the x-axis. It has the form x=a where a is the x-coordinates of any points on the line. Since the line crosses through (0,1), the equation is x=0.
Answer: 50 - a = 49
Step-by-step explanation:
50 x a =50
50 x 1 = 50
a=1
50 - a = 50 - 1
50 - 1 = 49