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

ManuelBautista2019 Mar 6, 2018

#1**+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

CPhill Mar 6, 2018