Asked by alexis
                Find two numbers 
a
and
b
whose sum
a
+
b
is 2 and whose difference
a
−
b
is -4?
            
        a
and
b
whose sum
a
+
b
is 2 and whose difference
a
−
b
is -4?
Answers
                    Answered by
            oobleck
            
    a+b = 2
a-b = -4
add the two lines and you get
2a = -2
and the rest is easy.
    
a-b = -4
add the two lines and you get
2a = -2
and the rest is easy.
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