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Does either of the equations have an isolated variable in it?
(8,11)
When solving a system of equations using substitution, there are three steps.
(I):y= x+3
(I):Distribute 2
(I):Add terms
(I):LHS-6=RHS-6
(I):.LHS /4.=.RHS /4.
(II):x= 8
(II):Add terms
(I), (II): x= 8, y= 11
(I):Multiply
(I), (II):Add terms