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Sagot :
Answer:
No
(The first system is correct but the second one is wrong)
Step-by-step explanation:
You can plug (-10,10) into these equations
a) 18(-10)+20(10)=20
-180+200=20
20=20
b) 20(-10)-2(10)=9
-200-20≠9
-220≠9
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