When solving a system of 2 equations and 2 unknowns using the substitution method, what is the ideal value of the coefficient of the isolated variable?

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

no association

step-by-step explanation:

if you have eyes and you can use them efficiently you can see that it just looks like random dots like do a line of best fit and like they're so spread out it's such a weak association you might as well consider it nonexistent