Question

sejam as equaçaes 4x-y=22 e -x+2y=-9

Answer 1

Olá Bia

4x - y = 22 (*2)
-x + 2y = -9 
8x - 2y = 44

7x = 35
x = 35/7 = 5

-5 + 2y = -9
2y = -9 + 5 = -4
y = -2

S = (5, -2)

Answer 2

4x-y=22(2)
-x+2y=-9
8x - 2y = 44
-x + 2y = - 9
7x = 35

x= 5
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4x - y = 22
y = 4x - 22
y= 4.5 - 22
y = 20-22

y = - 2
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S = {( 5, - 2 ) }