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avatar+1405 

True or false?

 

1-When one equation is of the first degree and the other is of a higher degree, they are best solved by Addition or subtraction

 

True or False

 

2-If a line is tangent to a circle, the roots of their equations are imaginary

 Mar 6, 2018
 #1
avatar+100516 
+2

1.  Not neccessarily

 

For instance

 

y  = x^2 - 25             (1)

x  - 5   = 0    ⇒    x  = 5    (2)

 

Is best solved  by   substituting  (2)   into (1)  ......so....False

 

2.  False.....look at the graph of these :

 

https://www.desmos.com/calculator/3jcfobc82b

 

x^2 + y^2  =  25

x - 5   = 0

 

Both of the equations have real roots

 

 

cool cool cool

 Mar 6, 2018
 #2
avatar+1405 
+1

Thanks

 Mar 6, 2018

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