A phone company charges $0.06 per minute for local calls and $0.15 per minute for international calls. When your bill comes, it
states that you accumulated 852 minutes with a charge of $69.84. Write and solve a system of linear equations to find the number of local and international minutes used.
Let x = number of minutes of local calls. y = number of minutes of international calls. By writing the system of equations we have: 0.06x + 0.15y = 69.84 x + y = 852 Solving the system Clear y from equation two y = 852-x Replace y in equation 1 0.06x + 0.15 (852-x) = 69.84 Clear x 0.06x + 127.8 - 0.15x = 69.84 127.8 - 69.84 = 0.15x -0.06x 57.96 = 0.09x x = 57.96 / 0.09 = 644 x = 644 Replace x in any of the two equations and clear y: x + y = 852 y = 852-644 y = 208 answer number of minutes of local calls = 644 number of minutes of international calls = 208
