Question

qual a conta da equaçao 2x+3y=7 e 3x-5y=1

Answer 1

2x + 3y = 7 . (3)
3x - 5y = 1 . (-2)

6x + 9y = 21
-6x + 10y = - 2 (+)
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19y = 19
y = 19/19
y = 1

2x + 3y = 7
2x + 3.1 = 7
2x + 3 = 7
2x = 7 - 3
2x = 4
x = 4/2
x = 2

R.: x = 2 ; y = 1