Answer:
x=2.2 y=4
Explanation:
Lets start with the first line
3y=23-5x
then you put the value of 3y into the second sentence
23-5x=15x-21
-20x=-44
x=2.2
then you put the value of x into first or second sentence to get y
5*2.2+3y=23
3y=12
y=4
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