Write a system of equations to describe the situation below, solve using substitution, and fill in the blanks.
Sally, an artist, plans to paint and sell some miniature paintings. She just
bought some brushes for $72, and paint and canvas for each painting costs
$21; she will sell each painting for $57. Once Sally sells a certain number of
her paintings, she will be breaking even. How much will Sally have earned?
How many paintings will that be?

what are the answer choices given for this problem?

alright so i think for this one it would to draw it out. this may be hard for me to try and draw, but i will do my best on here:

        r

  /       |     \

notice how it forms 2 triangles inside one bigger triangle.

so if we know the angle spr is the same as psr that is saying the measure of angle p is the same as angle s. this means the big triangle psr is either isosceles or equilateral. in both cases, the triangle is perfectly symmetrical when split down the middle, which is in this case rq. because we know it is perfectly symmetrical on both sides, we know that the two triangles inside the bigger one are equal.