All categories

3 years ago

Please help me answer this using systems of equations with elimination.

Mathematics

1 answer:

Triss [41]3 years ago

3 0

-5x+13y=-7
5x+4y=24
add the equation to eliminate x:
13y+4y=-7+24
17y=17
solve for y:
17/17y=17/17
y=1
then plug in y into any equation to solve for x:
-5x+13y=-7, y=1
-5x+(13*1)=-7
-5x+13-13=-7-13
-5x=-20
-5/-5x=-20/-5
x=4
the answers are x=4, y=1

You might be interested in

The average length if a female dolphin is about 131 in what is the length in ft and in

solong [7]

Answer:

10' 11''

Step-by-step explanation:

131 / 12 = 10.1666...

10 * 12 = 120

131 - 120 = 11

12 represents the feet and the remainder, 11, is the inches.

6 0

3 years ago

A waitress earned $73 for 6 hours of work. The total included $46 in tips. What was her hourly wage?

sveta [45]

$73-$46= $27
$27/6= $4.50

3 0

3 years ago

a town is east texas received 10 inches of rain in two weeks. if it kept raining at this rate for a 31-day month, how much rain

lyudmila [28]

20 because 2 weeks is 28 day and all you have to do is do sum decimals

7 0

3 years ago

Read 2 more answers

It costs $20.50 to enter an amusement park and $0.25 to ride a ride. You have $21.50. Write an equation that represents the numb

Mrac [35]

Answer:

4 rides

Step-by-step explanation:

Total amount = $21.50

Entry charge = $20.50

Amount left = $21.50 - 20.50 = $1

Number of rides

$r = \frac{1}{0.25} = \frac{100}{25} = 4 \\$

Another way:

$0.25\:r + 20.50 = 21.50\\0.25\:r = 21.50 - 20.50\\0.25\:r = 1\\r = \frac{1}{0.25}\\r = \frac{100}{25}\\r = 4\\$

4 0

3 years ago

HELPPP!!! And explain please.

V125BC [204]

Answer:

After correcting error of Mia and solving the expression $0.38 \times 3 \div(-1/20)\times5\div(-8)$ we get 14.25

Step-by-step explanation:

The given expression is: $0.38 \times 3 \div(-1/20)\times5\div(-8)$

First I solve the expression, and then will point the error

$0.38 \times 3 \div(-1/20)\times5\div(-8)\\Converting \ \div \ sign \ into \ \times the \ term \ is \ inverted\\=0.38 \times 3 \times(-20)\times5\times(-1/8)\\=0.38\times 3 \times-20\times5\times-1/8\\=1.14 \times-20\times5\times-1/8\\=-22.8\times5\times-1/8\\=-114\times-1/8\\=\frac{-114}{-8}\\=14.25$

So, the mistake Mia did was when she inverted division sign into multiplication, she didn't invert the term next to division sign.

The step she did was: $0.38 \times 5 \times(1/20)\times3\times(-8)$

While the correct step was: $0.38 \times 3 \times(-20)\times5\times(-1/8)$

After correcting error of Mia and solving the expression $0.38 \times 3 \div(-1/20)\times5\div(-8)$ we get 14.25

3 0

3 years ago