Mathematics, 14.12.2021 22:50, isabel81ie

What is the first step to solve the following system of equations using substitution? x - y = 12
2x - y = 12
A.) Add the two equations together.
B.) Solve the first equation for x.
C.) Multiply the first equation by 2.
D.) Divide the second equation by 2.

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What is the first step to solve the following system of equations using substitution? x - y = 12