HELP PLEASE!!! THIS IS DO THIS MORNING
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Call the number of blue jays 
and the number of robins 
We are told there are twice as may robins as blue jays:
and, there are 21 birds in total:
thus, by substitution:
combine like terms:
solve for:
back substitute:
There are 7 blue jays and 14 robins.
We are told there are twice as may robins as blue jays:
and, there are 21 birds in total:
thus, by substitution:
combine like terms:
solve for
back substitute:
There are 7 blue jays and 14 robins.