Question

En el sistema, encontrar el doble de y:
2x + y = 5
x + y = 4

a) 6
b) 4
c) 3
d) 2

Answer 1

Answer:

y=3

x=1

Step-by-step explanation:

1 by substitution method

2x+y=5 (1)

x+y=4 (2)

find x in eq 2

x=4-y

put the value in eq 1

2x+y=5

2(4-y)+y=5

8-2y+y=5

8-y=5

-y=5-8

-y=-3

y = 3

x=4-y

x=4-3

x=3

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