Answer:
x − y = − 3
Explanation:
The standard form of a linear equation is Ax + By = C
It is most of the time also stated that A must be positive and A, B, and C should all be integers.
y = x + 3
you can subtract x from both sides, so you get:
y - x = x - x + 3
y - x = 3
This is sometimes regarded as the standard form, but most of the time, you need to make sure that A is positive, and it is currently -1. How can we change a negative number to a positive number: we multiply by -1. Also, whatever you do at the left part, you must also do at the right part:
-1 . (y - x) = -1 . 3
-y + x = -3
After some reordering you get:
x - y = -3