Answer:
x-y = -7
Explanation:
Ax + By = C is the standard form for a line where A is a positive number
y = x + 7
Subtract x from each side
-x+y = x+7-x
-x+y = 7
Multiply each side by -1
x - y = -7
Standard Form: Ax + By = C
Step 1: Move the x over
-x + y = 7
Step 2: Factor out a -1
-1(x - y) = 7
Step 3: Divide both sides by -1
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