What is the product of -3.4 and 2.5
2 answers:
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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.
Based on your image, I will assume u meant:
This means that x will have two solution sets, due to the absolute value.