Question

resolva o sistema: x+2y=7 3x-2y=19

Answer 1

x+2y=7
3x-2y=19 (+)
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4x = 26 (:2)
2x = 13
x = 13/2

x + 2y = 7
13/2 + 2y = 7
2y = 7 - 13/2
2.2y/2 = (2.7 - 1.13)/2
4y = 14 - 13
4y = 1
y = 1/4

R.:
X = 13/2 y = 1/4