Customers of a phone company can choose between two service plans for long distance calls. The first plan has a $25 monthly fee
and charges an additional $0.14 for each minute of calls. The second plan has no monthly fee but charges $0.18 for each minute of calls. For how many minutes of calls will the costs of the two plans be equal?
25.14 x 3 minutes of calls = 75.42 75.42 / 0.18 = 419 or 0.18 x 419 minutes of calls = 75.42
So, for the 1st plan there is 3 minutes of calls and the 2nd plan there is 419 minutes of calls. The costs of the two plans will be equal which is $75.42 each.
X + y = 180 Y = wheat, x = oats Y = x + 20. In the 1st equation, get y by itself getting y = 180 - x. So 180 - x = x + 20. Subtract x on both sides to get 180 - 2x is 20. Subtract 180 to both sides is -2x = -160. Divide -2 to both sides is x = 80. So 80 + 20 is 100 wheat, and 80 oats of acres.
