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2 years ago

10

And put her dog Simon on a diet for three weeks. Simon lost 3 pounds the first week, gained 1.75 pounds the second week, and los

t 2.5 pounds the third week what was his net weight gain or loss ?

2 answers:

Romashka-Z-Leto [24]2 years ago

6 0

This is easy enough for you to do on your own.

Papessa [141]2 years ago

5 0

Simon's net weight loss is 3.75 lbs
-3 + 1.75 - 2.5 = -3.75

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iVinArrow [24]

$\fbox{Solution by using Matrix}$

$\text{Linear Equation} = -8x-8y=0 , -8x+2y=-20$

$\text{Rewrite the linear equations above as a matrix}$

$\left[\begin{array}{ccc}8&-8&0\\-8&2&-20\\\end{array}\right]$

$\text{Apply to Row2 : Row2 + Row1}$

$\left[\begin{array}{ccc}8&-8&0\\-8&-6&-20\\\end{array}\right]$

$\text{ Simplify rows}$

$\left[\begin{array}{ccc}8&-8&0\\0&1&10/3\\\end{array}\right]$

$\text{Note: The matrix is now in echelon form.}$ $\text{The steps below are for back substitution.}$

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$\left[\begin{array}{ccc}8&0&80/30\\0&1&10/3\\\end{array}\right]$

$\text{ Simplify rows}$

$\left[\begin{array}{ccc}1&0&10/3\\0&1&10/3\\\end{array}\right]$

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Step-by-step explanation:

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Option D is the same answer if we multiply -2 in the second term

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