A student is asked to solve the following system of equations using substitution: -2x +y = -1 x-y = 1 Identify a possible third equation that must be solved to find the solution using substitution. Select one: O a. -2x +(x- 1) = 1 O b. -2x +(x-1) = -1 Ос. - 2(у-1)+ун-1 O d. -2(1-y)+y = -1

Q: Solve the system.

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A: Explanation of the answer is as follows

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A: Given