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Ksivusya [100]
2 years ago
15

1 y = 3x - 4 2 x + y = 8 use the method of substitution

Mathematics
1 answer:
Charra [1.4K]2 years ago
5 0

Answer:

x = 2.4; y = 3.2

Step-by-step explanation:

y = 3x - 4

2x + y = 8

2x + 3x - 4 = 8

5x - 4 = 8

5x = 12

x = 12 / 5

x = 2.4

y = 3(2.4) - 4

y = 7.2 - 4

y = 3.2

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Step-by-step explanation:

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<u>Conclusion</u>

The speed of the faster plane was 800 km/h; of the slower plane, 600 km/h.

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<em>Check</em>

The travel time for the faster plane was 3600/800 = 4.5 hours. For the slower plane, 3600/600 = 6 hours, a difference of 1.5 hours.

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