Question

pratice set 1.2
x+y=0;2x-y=9
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Answer 1

Step-by-step explanation:

x+y=0

∣x =3 ,1 ,2∣

∣y =−3 ,−1 ,−2∣

2x−y=9

∣x =3 ,0 ,1∣

∣y =−3 ,−9 ,−7∣

Answer 2

Step-by-step explanation:

Refer to the attachment.