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24-11-2020
Mathematics

contestada

15x + 5y = 20 y = 8 - 3x

Respuesta :

24-11-2020

Answer:

Step-by-step explanation:

15x+5y=8-3x

18x+5y=8⇒eqn 1

15x+5y=20y

15x-15y=0⇒eqn 2

eqn 1 * 3

54x + 15y=24⇒eqn 3

eqn 3 + eqn 2

69x=24

x=24/69=0.3478

eqn 1⇒

5y=8-18(24/69)

y=1.7391/5

y=0.3478

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