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Answer:
x=9/23 and y=18/23
Step-by-step explanation:
Substitute 2 x for y in 25x−y=9
25x−y=9
25x−2x=9
23x=9
23x/23=9/23
x=9/23
substitute 9/23 for x in y=2x
y=2x
y=2(9/23)
y=18/23
x= 9/23 and y=18/23