2x + 3y - z = -4 x - y = -3
3x – 2y + 3z = 1
I really need help on how to simplify and how to do all the steps. Systems of equations using substitution

In the figure below, segment ac is congruent to segment ab: triangle abc with a segment joining vertex a to point d on side bc. side ab is congruent to side ac which statement is used to prove that angle abd is congruent to angle acd? segment ad bisects angle cab. triangle acd is similar to triangle abd. segment ad is congruent to segment ac. angle cab is congruent to angle cba.

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?