You are incorrect -
The first step is to isolate the variable.
Y= mX + b
Then substitute this equation for Y into the second equation.
Multiplying first is needless complication. Also - it starts “blending” information from the two equations too early. No need to blend.
From your note - apparently there is a LOT of confusion.
The test did not say it was the best method, just to show how it would be done if it was done this way. It’s a test of being able to add (or subtract) equations I guess.
The first step is to isolate the variable. Y= mX + b
No, you are incorrect. The question is to pick the first step for the elimination method, not the substitution method.
From your note - apparently there is a LOT of confusion.
How so?