B. 2 + 7 = 9 Β Not a linear equation, as there is no variable.
C. 3x + 5 = 20 Β This is a linear equation.
D. y = 2x + 1 Β This is a linear equation.
Answer from: Quest
i used to know but i learned it a long time ago sorry
step-by-step explanation:
Answer from: Quest
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