X and y are gonna be the variables you will solve when you do it by substitution. x=3 and y=11
(Giving brainliest to correct answer) Congruence
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To isolate the variable means to have it by itself on one side of the equation, where the variable equals an expression.
To isolate , we will need to remove the variables and other terms "connected" to the
variable:
By dividing terms "connected" to our variable, we have isolated it one side of the equation.