Question

Solve the system of equations by substitution y=1-x; -2x+y=4

Answer 1

`\displaystyle [-1, 2]`

Explanation:

`\displaystyle -2x + [1 - x] = 4 → 4 = 1 - 3x → (3)/(3) = (-3x)/(3); -1 = x, 2 = y \\ \\ [-1, 2]`

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