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nataly862011 [7]

3 years ago

6

Twice a number increased by 7 is 13. Find the number.

1 answer:

Alborosie3 years ago

5 0

Answer:

6

Step-by-step explanation:

13-7=6

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What is the determinant of the coefficient matrix of the system

Ad libitum [116K]

$\left[\begin{array}{ccc}-3&0&-2\\9&0&5\\6&0&-12\end{array}\right] \\D(system)= |-3|\left[\begin{array}{ccc}0&5\\0&-12\\\end{array}\right]-0 \left[\begin{array}{ccc}9&5\\6&-12\\\end{array}\right] +|-2| \left[\begin{array}{ccc}9&0\\6&0\\\end{array}\right] \\=3*0-0+0=0\\
determinant of system is 0$

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mrs_skeptik [129]

Answer:

160+2x

Step-by-step explanation:

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2 years ago

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Ainat [17]

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TEA [102]

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