Jones like to watch the bird in her yard one morning she notices that there were twice as many robins as Blue Jays. if she count
2 answers:
Call the number of robins 'r' and the number of blue jays 'b'.
We are told there are twice as many robins as blue jays, thus:
We are also told there are 21 birds total:
By substitution:
Then using the other equation with known values:
There are 7 blue jays and 14 robins.
Check by backsubstitution:
CHECKS.
We are told there are twice as many robins as blue jays, thus:
We are also told there are 21 birds total:
By substitution:
Then using the other equation with known values:
There are 7 blue jays and 14 robins.
Check by backsubstitution:
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