Using the substitution method, Vito is solving the following system of equations algebraically. Which equivalent equation could Vito use? y=-3x-4
2x-3y=-21

A. 2(-3-4)+3x=-21
B. 2x-3(-3x-4)=-21
C. 2(3x-4)+3x=-21
D. 2x-3(3x-4)=-21

Aline parallel to a triangle's side splits ab into lengths of x - 5 and x + 2. the other side, ac, is split into lengths of x and x + 12. what is the length of ac? a) 12 b) 24 c) 36 d)

3women sell hats at a craft fair weekly. the money they make at the fair is split into categories. 9% goes to pay taxes. $55 goes to pay rent for the space they sell in. the rest is split between the women. if the group make $706 at the fair, how much does each women get paid once the money is divided

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.