Question 1024557
Call the number of bags of seeds and bird feed, x and y.  Then we write
x + y = 6  and
5x + 4y = 28
Now multiply the top equation by 5 and subtract it...we get
5x + 4y = 28
-(5x + 5y = 30)
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-y = -2
y = 2 bags of bird feed mix
x = 4 bags of seeds