All categories

3 years ago

12x=76-20y 8x=84-20y

Mathematics

1 answer:

levacccp [35]3 years ago

4 0

Answer:

Step-by-step explanation:

$\left\{\begin{array}{ccc}12x=76-20y&\text{change the signs}\\8x=84-20y\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}-12x=-76+20y\\8x=84-20y\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad-4x=8\qquad\text{divide both sides by (-4)}\\.\qquad x=-2\\\\\text{put the value of x to the second equation}\\\\8(-2)=84-20y\\-16=84-20y\qquad\text{subtract 84 from both sides}\\-100=-20y\qquad\text{divide both sides by (-20)}\\5=y\to y=5$

You might be interested in

You open a saving account and deposit 420.00 one month later, the balence in the account is 4208.40.

photoshop1234 [79]

The monthly rate of growth for the savings account is $8.40.

6 0

2 years ago

At its highest point, the elevation of a county is 5,764 feet above sea level. At its lowest point, the elevation of the count

Feliz [49]

Answer:

$Difference = 5757\ feet$

Step-by-step explanation:

Given

$Highest\ Point = 5764\ feet$

$Lowest\ Point = 7\ feet$

Required

Determine the difference between the points

The difference is calculated as follows:

$Difference = Highest - Lowest$

$Difference = 5764\ feet - 7\ feet$

$Difference = 5757\ feet$

8 0

3 years ago

Ross collects lizards , beetles and worms . He has more worms then lizards and beetles together. Altogether in the collection th

den301095 [7]

7 worms, 3 beetles, 2 lizards
<span>I found this by first doing the calculations for the number of legs (26). First, I added the legs for the 3 beetles together to get 18 legs. Then I added the legs for 2 lizards (8) to the beetles’ legs to get 26 legs in total.To find the number of heads I added the number of lizard heads (2) and beetles heads (3) to get five heads. Then I added the 7 worm’s heads to the lizard and beetles heads to get 12 heads in total.</span>

8 0

3 years ago

If $6500 is invested at a rate of 6% compounded continuously, find the balance in the account after 3 years

Alex787 [66]

$\bf ~~~~~~ \textit{Continuously Compounding Interest Earned Amount} \\\\ A=Pe^{rt}\qquad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{original amount deposited}\dotfill & \$6500\\ r=rate\to 6\%\to \frac{6}{100}\dotfill &0.06\\ t=years\dotfill &3 \end{cases} \\\\\\ A=6500e^{0.06\cdot 3}\implies A=6500e^{0.18}\implies A\approx 7781.91$

6 0

3 years ago

I neeeeeeddddd helppppppppppppppp

Aleks04 [339]

Answer:

x = 4

Step-by-step explanation:

Cross multiply:

21*2 = 14(x - 1)

42 = 14x - 14

14x = 56

x = 4

8 0

2 years ago

Read 2 more answers