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Answer: {y,x} = {9,5}
Step-by-step explanation:Solve the equation [1] y = 9
[1] y= 9
Plugs this in for variable y in equation [2]
[2]. (9) - x = 4
[2]. - x = - 5
Solve equation [2] for the variable x
[2]. X=5
By now we know this much
Y=9
X=5