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geniusboy [140]
3 years ago
9

Solve by using substitution: y = 2x - 5 and y = 5x + 7 *

Mathematics
1 answer:
faltersainse [42]3 years ago
4 0

Answer:

x = -4, y = -13

Step-by-step explanation:

2x - 5 = 5x + 7

3x = -12

x = -4

Y = 2(-4)-5 = -13

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Marlo uses 252 lb of gravel to cover a garden plot of 36 ft2. clear check how many pounds of gravel does it take to cover one sq
timama [110]

7 lb will cover an area of 1 square foot, while 315 lb will cover an area of 45 square feet.

From given question,

252 lb = 36 ft²             ..........(1)

The number of pound for an area of 1 square foot is calculated as follows:

x = 1 ft²                       .......(2)

The area and the amount of gravel are illustrations of proportions.

From (1) and (2) we get an equation,

⇒ x × 36 = 252 × 1

⇒ x = 252/36

⇒ x = 7 lb

We need to find the area that could be covered with 315 lb of gravel

The area to be covered with 315 lb gravel is calculated as follows:

315 lb = y               ............(3)

From (1) and (3) we get an equation,

⇒ y × 252 = 36 × 315

⇒ y = 45 ft²

Therefore, 7 lb will cover an area of 1 square foot, while 315 lb will cover an area of 45 square feet.

Learn more about the proportions here:

brainly.com/question/13114933

#SPJ4

4 0
1 year ago
Factor. 49x^2−36y^2 <br> Enter your answer in the boxes.
wel

\\Rewrite \ in \ form.\\\\(7x)^2 - (6y)^2\\\\\\\\Use \ difference \ of \ squares \  rule.\\\\(7x  + 6y) (7x - 6y)\\\\\\Therefore, \ you \ get \fbox{(7x+6y)&(7x-6y)}.

3 0
3 years ago
Jayda is running around a track where 3 laps is 5km. She runs 6 laps in 20 min. What is her speed in min per km
zzz [600]

Answer:

2km/m

Step-by-step explanation:

6 laps = 10km

(because 3 x 2 = 6 and double 5km as well)

Distance divide time = speed

20 mins divided by 10km = 2km per minute

3 0
3 years ago
Jacob won 62 super bouncy balls playing
Alinara [238K]

Answer:

30

Step-by-step explanation:

62 = 2x+2

62-2 = 60

60/2 = 30

7 0
3 years ago
Please help me with my math problem!!Thank you!! :)
vova2212 [387]

Check the picture below.

6 0
3 years ago
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