Y=x+3 and y=-x-5.Is the line parallel, perpendicular or neither?

Perpendicular.

Step-by-step explanation:

For parallel lines  slopes are equal.

The slope of y = x + 3 is 1 and the slope of y = -x - 5 is -1 so they are not parallel.

For perpendicular lines  m1*m2 = -1 (where m1 and m2 are the slopes).

So these 2 lines are perpendicular.

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc