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4 years ago

100 POINTS!! somebody please answer! but it has to correct!

Mathematics

1 answer:

slava [35]4 years ago

6 0

Step-by-step explanation:

$\left\{\begin{array}{ccc}x-7y=4&\text{multiply both sides by 3}\\-3x+21y=5\end{array}\right\\\underline{+\left\{\begin{array}{ccc}3x-21y=12\\-3x+21y=5\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad\qquad0=17\qquad\bold{FALSE}\\\\\bold{CONCLUSION:}\ \bold{no\ solutions}\\\\\text{What do you know about the two lines in the system of equations? }\\\\\text{The lines do not have a common point (s).}\\\text{They don't intersect. Therefore, they are parallel lines.}$

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The total cost of 8 sharpeners and 3 sketchbooks is $26.05. If the cost of a sharpener is $a, and a sketchbook is $1.90 more exp

koban [17]

Answer:

1.85

Step-by-step explanation:

So, s (sketchbook) is a+1.90.

8a+ 3(a+1.90)=26.05

8a+3a+5.7=26.05

11a=20.35

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Check:

8x1.85=14.8

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4 0

3 years ago

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UkoKoshka [18]

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3 years ago

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Rom4ik [11]

Answer:

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Step-by-step explanation:

Given:

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Find:

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3 0

3 years ago

How do i solve this?

Law Incorporation [45]

Answer:

$\large\boxed{x$

Step-by-step explanation:

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4 years ago

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taurus [48]

Answer:

20/5

36/2

16/6

10/5

Step-by-step explanation:

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7 0

3 years ago