Question

ecuaciones lineales de dos incognitas

2 × - 3y= 9
4 × + 3y = 9
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Answer 1

Respuesta:

1. 2x-3y = 9

2x =9 +3y

x=9+3y /2

2. 4x+3y =9

4x =9-3y

x=9-3y/4

9+3y /2 = 9-3y/4

4(9+3y ) = 2(9-3y)

36-12 y = 18 -6y

36+18 = 6y+12y

54 = 18y

54 /18 = y

y= 3