All categories

2 years ago

And

Mathematics

1 answer:

mojhsa [17]2 years ago

7 0

Answer:

x = -1 , y = 2 thus the answer is B

Step-by-step explanation:

Solve the following system:

{2 y - 5 x = 9 | (equation 1)

{3 x + 5 y = 7 | (equation 2)

Add 3/5 × (equation 1) to equation 2:

{-(5 x) + 2 y = 9 | (equation 1)

{0 x+(31 y)/5 = 62/5 | (equation 2)

Multiply equation 2 by 5/31:

{-(5 x) + 2 y = 9 | (equation 1)

{0 x+y = 2 | (equation 2)

Subtract 2 × (equation 2) from equation 1:

{-(5 x)+0 y = 5 | (equation 1)

{0 x+y = 2 | (equation 2)

Divide equation 1 by -5:

{x+0 y = -1 | (equation 1)

{0 x+y = 2 | (equation 2)

Collect results:

Answer: {x = -1 , y = 2

You might be interested in

Multiplication made for 840 here's the numbers 11 3 4 5 2 3 7 6 14 what do I use to get 840 using only those numbers Help quick!

xxTIMURxx [149]

you can use the numbers 3, 4, 5, 2, 6, 7, and 14. You can multiply 3 times 280 to get 840, 210 times 4 to get 840, 5 times 168 to get 840, 2 times 420 to get 840, 140 times 6 to get 840, 7 times 120 to get 840, and 14 times 60 to get 840.

7 0

2 years ago

One night Ricky and her brother Micky decide to have some fun at their father's sweet shop. In the

vova2212 [387]

Answer:

a) 3034

b)249

Step-by-step explanation:

jellyb beans: 7*135= 945

choc buds: 9*121=1089

smarties: 12*70=840

liquorice sticks: 32*5=160

a) the total number of sweets: 945 + 1089 + 840 + 160 = 3034

b) the difference between the number of choc buds and the number of smarties: 1089 - 840 = 249

P.S. Hope it helps. If you have any questions, feel free to ask them in the comment section below. I'll be happy to help. Have a wonderful day!

8 0

1 year ago

Leilani dropped an acorn from her tree house. It took 1.1 seconds to hit the ground below. Find the height in feet from which sh

ratelena [41]

Your answer is 0.605

3 0

2 years ago

Satin ribbon is sold for

Nutka1998 [239]

Answer:

1892.3

Step-by-step explanation:

221 ounces in pounds is 13.8125 pounds to you multiply that by 137 to get your total of 1892.3125

3 0

2 years ago

A car travels 20 mph slower in a bad rain storm than in sunny weather. the car travels the same distance in 2 hrs in sunny weath

ycow [4]

You can create two equations.

"A car travels 20 mph slower in a bad rain storm than in sunny weather."

$\sf x-20=y$

Where 'x' represents speed in sunny weather and 'y' represents speed in rainy weather.

"The car travels the same distance in 2 hrs in sunny weather as it does in 3 hrs in rainy weather."

$\sf 2x=3y$

Where 'x' represents speed in sunny weather and 'y' represents speed in rainy weather.

We want to find the speed of the car in sunny weather, or 'x'. Plug in the value for 'y' in the first equation into the second equation.

$\sf \boxed{\sf x-20}=y$
$\sf 2x=3y\rightarrow2x=3(x-20)$

Distribute:

$\sf 2x=3x-60$

Subtract 3x to both sides:

$\sf -x=-60$

Divide -1 to both sides:

$\sf x=60$

So the car goes 60 mph in sunny weather.

5 0

2 years ago