Step-by-step explanation:
This is an acute triangle
20+x = 12+2x is the answer and x=8
standard from Ax +By = C
y = 4x+10
subtract 4x from each side
-4x+y = 10
or 4x - y = -10
The nature of the roots can be determined by the determinant of the equation. The determinant is:
b² - 4ac
If this is positive, there are two roots
If this is 0, there is only one root
If this is negative, there are complex roots
Opposite sides are parallel
Opposite angles are congruent
Opposite sides are congruent.
