Answers: 1
![\bf \begin{cases} -3x-2y=5.5\\[-0.5em] \hrulefill\\ x+3y=7.5\\ \boxed{x}=7.5-3y \end{cases}~\hspace{5em}\stackrel{\textit{substituting \underline{x} in the 1st equation}}{-3\left( \boxed{7.5-3y} \right)-2y=5.5} \\\\\\ -22.5+9y-2y=5.5\implies -22.5+7y=5.5\implies 7y=28 \\\\\\ y=\cfrac{28}{7}\implies y=4 \\\\\\ \stackrel{\textit{substituting the found \underline{y} in the 2nd equation}}{x+3(4)=7.5\implies x+12=7.5}\implies x=-4.5 \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill (-4.5,4)~\hfill](/tpl/images/0018/9397/643a8.png)
Another question on Mathematics
Mathematics, 21.06.2019 14:30
The amount of money, in dollars, in an account after t years is given by a = 1000(1.03)^t. the initial deposit into the account was $_^a0 and the interest rate was _a1% per year. only enter numbers in the boxes. do not include any commas or decimal points^t. the initial deposit into the account was $__^a0 and the interest rate is % per year.
Answers: 1
Mathematics, 21.06.2019 21:00
Suppose a gym membership has an initial enrollment fee of $75 and then a fee of $29 a month. which equation models the cost, c, of the gym membership for m months?
Answers: 1
Mathematics, 21.06.2019 21:20
Amajor grocery store chain is trying to cut down on waste. currently, they get peaches from two different distributors, whole fruits and green grocer. out of a two large shipments, the manager randomly selects items from both suppliers and counts the number of items that are not sell-able due to bruising, disease or other problems. she then makes a confidence interval. is there a significant difference in the quality of the peaches between the two distributors? 95% ci for pw-pg: (0.064, 0.156)
Answers: 3
You know the right answer?
Solve by substitution -3x-2y=5.5 x+3y=7.5...
Questions
Mathematics, 10.03.2021 01:00
Mathematics, 10.03.2021 01:00
Health, 10.03.2021 01:00
Business, 10.03.2021 01:00
Mathematics, 10.03.2021 01:00
Mathematics, 10.03.2021 01:00
History, 10.03.2021 01:00
English, 10.03.2021 01:00
Mathematics, 10.03.2021 01:00
Mathematics, 10.03.2021 01:00
Arts, 10.03.2021 01:00
