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andriy [413]
3 years ago
10

Can someone please answer this number 9

Mathematics
1 answer:
nikitadnepr [17]3 years ago
8 0
I can send the rest of the work if you need it

the cost of the butternut squash is $1.74
the cost of the zucchini is $.84

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12% of what number is 18
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12% of what number is 18...." of " means multiply, " is " means equals
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Find a solution to the system of equations by finding the reduced row-echelon form of the augmented matrix for the system of equ
djverab [1.8K]

Answer:

y=15-3z

x=-5.25-0.25z

Step-by-step explanation:

You are given the system of two equations with three variables:

\left\{\begin{array}{l}4x-2y-5z=-51\\ \\4x-y-2z=-36\end{array}\right.

Write the augmented matrix for this system of equations

\left(\begin{array}{ccccc}4&-2&-5&|&-51\\4&-1&-2&|&-36\end{array}\right)

Now,  find the reduced row-echelon form of the augmented matrix for this system of equations. Subtract the second row from the first row:

\left(\begin{array}{ccccc}4&-2&-5&|&-51\\0&-1&-3&|&-15\end{array}\right)

You get the system of two equations:

\left\{\begin{array}{r}4x-2y-5z=-51\\ \\-y-3z=-15\end{array}\right.

From the second equation

y=15-3z

Substitute it into the first one:

4x-2(15-3z)-5z=-51\\ \\4x-30+6z-5z=-51\\ \\4x=-21-z\\ \\x=-\dfrac{21}{4}-\dfrac{1}{4}z\\ \\x=-5.25-0.25z

8 0
3 years ago
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