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Sagot :
[tex]A. \\
y=x^3 \\ \\
(1,3) \\
3=1^3 \\
3=1 \\
not \ true[/tex]
[tex]B. \\ y=3x \\ \\ (1,3) \\ 3=3 \times 1 \\ 3=3 \\ true \\ \\ (2,9) \\ 9=3 \times 2 \\ 9=6 \\ not \ true[/tex]
[tex]C. \\ y=3^x \\ \\ (1,3) \\ 3=3^1 \\ 3=3 \\ true \\ \\ (2,9) \\ 9=3^2 \\ 9=9 \\ true \\ \\ (3,27) \\ 27=3^3 \\ 27=27 \\ true \\ \\ (4,81) \\ 81=3^4 \\ 81=81 \\ true \\ \\ (5,243) \\ 243=3^5 \\ 243=243 \\ true[/tex]
[tex]D. \\ y=x+3 \\ \\ (1,3) \\ 3=1+3 \\ 3=4 \\ not \ true[/tex]
The answer is C.
[tex]B. \\ y=3x \\ \\ (1,3) \\ 3=3 \times 1 \\ 3=3 \\ true \\ \\ (2,9) \\ 9=3 \times 2 \\ 9=6 \\ not \ true[/tex]
[tex]C. \\ y=3^x \\ \\ (1,3) \\ 3=3^1 \\ 3=3 \\ true \\ \\ (2,9) \\ 9=3^2 \\ 9=9 \\ true \\ \\ (3,27) \\ 27=3^3 \\ 27=27 \\ true \\ \\ (4,81) \\ 81=3^4 \\ 81=81 \\ true \\ \\ (5,243) \\ 243=3^5 \\ 243=243 \\ true[/tex]
[tex]D. \\ y=x+3 \\ \\ (1,3) \\ 3=1+3 \\ 3=4 \\ not \ true[/tex]
The answer is C.
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