Question

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

Answer 1

Answer:

$\displaystyle [-1, 2]$

Step-by-step explanation:

$\displaystyle -2x + [1 - x] = 4 → 4 = 1 - 3x → \frac{3}{3} = \frac{-3x}{3}; -1 = x, 2 = y \\ \\ [-1, 2]$

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