That its roots (solutions) are coincident.
A line can have at most one root and so coincident roots for a line are not possible.
If the slopes are different the lines are neither - they intersect. They are parallel or coincident if the slopes are the same. Then, if the y-intercepts are the same they are coincident while if the y-intercepts are different, they are parallel.
Yes. Although, they could be coincident which may not be covered by either of these descriptions.
Correct. Unless the parallel lines are coincident, in which case the solution set is the whole line.
That its roots (solutions) are coincident.
That its roots (solutions) are coincident.
A line can have at most one root and so coincident roots for a line are not possible.
Coincident
coincident
The equation ax^2 + bx + c = 0 where a, b and c are real and a is non-zero has discriminant D = b^2 – 4ac. Then,if D > 0 the equation has two real roots which are distinct;if D = 0 the equation has two real roots which are coincident;if D < 0 the equation has two roots which form a complex conjugate pair (advanced mathematics only).
A. Coincident
on purpose. intentionally.
"Coincident" is an adjective.
accessory, belonging, coincident, agreeing
It has only one unique real root. There are some mathematical advantages in considering such a situation as two coincident real roots. However, given that you have to ask this question, you are still some way off getting to that level of maths - if you ever choose to do so.
moves at the same time as the economy does (GDP)