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12-01-2021
Mathematics

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5.) x + 3y = 21
- 4x + y = 0

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12-01-2021

(x, y) = (21/13 , 84/13)

Step-by-step explanation:

x + 3y = 21

- 4x + y = 0

y = 4x

_____________

x + 3y = 21

x + 3(4x) = 21

x + 12x = 21

13x = 21

x = 21/13

y = 4x

y = 4 (21/13)

y = 84/13

(x, y) = (21/13 , 84/13)

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