You have to isolate the variable using inverse operations in order to get it alone. Example: x+3=5
Subtract 3 on both sides since you are adding 3, and subtraction is the opposite of addition.
x=2 is your answer. If you check and plug it in, you will see that it is a correct equation.
Well, when you say which pair, I would expect that there would be some choices to choose from... if it is one of the choices, I would go with
a point and a line.
2/5ths divides by 3 and 1/10 is 0.129
A negative discriminant indicates no real solutions, since you cannot take the square root of a negative number and get a real answer. Instead, you get an imaginary number, which cannot be graphed on a normal x/y graph.