John buys some boxes of pencils and some packets of pens for people to use at a conference.

there are 40 pencils in a box.

there are 15 pens in a packet.

john gives one pencil and one pen for each person at a conference.

he has no pencils or pens left.

how many boxes of pencils and how many packets of pens did john buy?

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

thats not a system of equations, that is a solution