1. Start your equation by making lines like this - = - 2.On the top right side put x 3.On the bottom right side put 85 4. On the top left side put 3 5.On the bottom left side put 100 6. It should look like this 3 = x - - 100 85 7. Cross multiply ( 100 times x equals 100x and 3 times 85 is 253 ) 8. Divide both by 100 (100x divided by 100 equals 1x and 253 divided by 100 is 2.53) 9. Add 2.53 to 85 (getting 87.53) 10. The answer is: The cost of their TV service is $87.53
