Question

2 solve the system of equations by substitution:
$x - y = 7$
$x - y = -4$

Explanation:

Step1: Analyze the two equations

The system is:
$$x - y = 7$$
$$x - y = -4$$

Step2: Substitute the expression for $x-y$

From the first equation, $x-y=7$. Substitute this into the second equation:
$$7 = -4$$
This is a contradiction, as 7 cannot equal -4.

Answer:

There is no solution to the system of equations (the system is inconsistent).