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Does either of the equations have an isolated variable in it?
(-5/7,22/7)
When solving a system of equations using substitution, there are three steps.
(II):y= x+3
(II):Distribute 4
(II):Add terms
(II):LHS-12=RHS-12
(II): .LHS /7.=.RHS /7.
(I):x= -5/7
(I): Add terms
(I), (II): x= - 57, y= 2 27
(II): a bc=a* c+b/c
(II): Multiply fractions
(I), (II): Add terms
(II): Calculate quotient