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3 years ago

Number 6 I need help

Mathematics

1 answer:

andrey2020 [161]3 years ago

3 0

Double check my answer and try to work it out, but this is what I did..

139 divided by 10 is 13.9, so about 14. so about 14 groups of 10.

so if they made 14 groups of their ten dollars, then the local business will contribute 50% of the 10 dollars made (5 dollars) for every time it is sold/gained.

so you will end up with 14 x 5=70. 70+139=209, which is less than 240.

So the answer is NO, it is not reasonable that they will end up with 240 total after the contributions made by raising 139 dollars worth of money.

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3 years ago

In order to solve the following system of equations by addition, which of the

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Multiply the top equation by -3 and the bottom equation by 2

Step-by-step explanation:

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$\begin{cases}4x-2y=7\\3x-3y=15 \end{cases}$

To solve the given system of equations by addition, make one of the variables in both equations sum to zero. To do this, the chosen variable must have the same coefficient, but it should be negative in one equation and positive in the other, so that when the two equations are added together, the variable is eliminated.

To eliminate the variable y:

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Multiply the bottom equation by 2 to make the coefficient of the y variable -6:

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Add the two equations together to eliminate y:

$\begin{array}{l r r}& -12x+6y= &-21\\+ & 6x-6y= & 30\\\cline{1-3}& -6x\phantom{))))))} = & 9\end{array}$

Solve for x:

$\implies -6x=9$

$\implies x=-\dfrac{9}{6}=-\dfrac{3}{2}$

Substitute the found value of x into one of the equations and solve for y:

$\implies 3\left(-\dfrac{3}{2}\right)-3y=15$

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1 year ago

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2 years ago

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3 years ago

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