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Sagot :
Answer: X = 10 and Y = -1
Step-by-step explanation:
X - Y = 11
X = 11 + Y (plug into the other equation)
2X + Y = 19
2 ( 11+Y ) + Y = 19
22 + 2Y + Y = 19
22 + 3Y = 19
-22 -22
————————-
3Y = -3
Y = -1 (plug into the original formula)
X - Y = 11
X - (-1) = 11
X + 1 = 11
-1 -1
—————
X = 10
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