Chelsea earns 30 per day plus 5 for every sale that she makes at her job In Thursday she want to earn at least 60

2 answers:

8 0

The equation of her earning is: 30 + 5x
Where, x = number of sale

Now, 30 + 5x = 60
5x = 60-30
x = 30/5
x = 6

So, If she wants to earn 60, she need to work for 6 sales

Hope this helps!

posledela3 years ago

7 0

Sell at least 6 items

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$\bf \begin{cases}
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\end{cases}$

so hmm the idea behind the elimination, is to make the value atop or below, of either variable, the same but with a negative sign

so hmmm say... we'll eliminate "y"

so... let's see, we have 2y and 5y, both positive
what do we multiply 2y to get a negative -5y, that way, -5y +5y = 0 and poof it goes

well let's see, let's try "k" $\bf 2yk=-5y\implies k=-\cfrac{5y}{2y}\implies k=-\cfrac{5}{2}$

so.. if we multiply 2y by -5/2, we'll end up with -5y

well, let's multiply that first equation then by -5/2

$\bf \begin{array}{rllll}
3x+2y=-9&\qquad\times -\frac{5}{2}\implies &-\frac{15}{2}x-5y=\frac{45}{2}\\\\
-10x+5y=-5&\implies &-10x+5y=-5\\
&&---------\\
&&\frac{-35}{2}x+0\quad=\frac{35}{2}
\end{array}\\\\
-----------------------------\\\\
\cfrac{-35}{2}x=\cfrac{-35}{2}\implies \cfrac{-35x}{2}=\cfrac{-35}{2}\implies x=\cfrac{2}{-35}\cdot \cfrac{-35}{2}
\\\\\\
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so.. now we know x = 1.... so let's plug that in say hmmm 2nd equation

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