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lina2011 [118]
3 years ago
13

2x-5y=22n y=3x-7 Use substitution to solve the system.

Mathematics
1 answer:
Elden [556K]3 years ago
7 0

Answer:

x = 1 , y = -4

Step-by-step explanation:

2x - 5y = 22 ------- ( 1 )

y = 3x - 7      ------- ( 2 )

Substitute ( 2 ) in ( 1 ) :

2x - 5 (3x - 7) = 22

2x - 15x + 35 = 22

- 13x = 22 - 35

- 13x =  - 13

 x = 1

Substitute x in ( 1 ) :

2x - 5y = 22

2 ( 1 ) - 5y = 22

- 5y = 22 - 2

-5y = 20

y = - 4

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Answer:

The answer to your question is 1.875 gallons

Step-by-step explanation:

Data

distance = 50 mi

volume of gas = 1 gal

volume for 150 km = ?

Process

1.- Convert 50 mi into kilometers

                         1 mile ------------------- 1.6 km

                          x        ------------------ 150 km

                          x = (150 x 1)/1.6

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2.- Calculate the gallons wasted

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                          x = (93.75 x 1)/50

                          x = 93.75/50

                         x = 1.875 gallons

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Step-by-step explanation:

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