Answer:
One solution
(-8, -5)
Step-by-step explanation:
The system of equations is
-3x + y = 19
y = x + 3
To solve the equation by addition, we need to rewrite the second equation as follows
y = x + 3
y - x = x + 3 - x
-x + y = 3
(-1)(-x) + (-1)(y) = (-1)(3)
x - y = -3
Now, we can add this equation to the first on, so
-3x + y = 19
x - y = -3
-2x + 0 = 16
Now, we can solve for x
-2x = 16
-2x/(-2) = 16/(-2)
x = -8
Then, using x = -8, we can find the value of y
y = x + 3
y = -8 + 3
y = -5
Therefore, the system has one solution and the solution is (-8, -5)