Question

Resolva a matriz: a+b= 12, x-y=9, 2a-3b=9, 2y-x=2
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Answer 1

a +b = 12

2a -3b = 9

3(I) + (II) ; 0b

(3 +2)a = (3)12 + 9

a = (36 +9)/5

a = 9

b = 12 -9

b = 3

x -y = 9

-x +2y = 2

(I) + (II)

y = 9 +2

y = 11

x = 9 +11

x = 20