Chapter 6 - Systems of Equations and Inequalities - Concept Byte - Matrices and Solving Systems - Page 382: 6

$3c+2d=315$ $2c+4d = 450$ c= 45 minutes (hair cut) d= 90 minutes (hair dye)

d = hairdye, c = hair cut Please see the image. The steps are as follows: Divide line 2 by 2. Combine like terms. Subtract line 2 from line 1. Combine like terms. Divide line 1 by 2. Combine like terms. Subtract line 1 from line 2. Divide line 2 by 2. Combine like terms.