Question 1092467
let x represent the number of gigbabytes used each month.


the at&t plan is 25 + 15 * x


the verizon plan is 40 + 10 * x


for the verizon plan to cost less than the at&t plan, then 40 + 10 * x must be less than 25 + 15 * x


your equation is 40 + 10 * x < 25 + 15 * x.


subtract 25 from both sides of the equation and subtract 10 * x from both sides of the equation to get 15 < 5 * x.


divide both sides of the equation by 5 to get 3 < x.


solve for x to get x > 3.


the verizon plan will cost less when the gigabytes of use each month is greater than 3.


look at 2, 3, and 4 gigabytes of usage per month.


the verizon plan will cost 60, 70, and 80 dollars per month.


the at&t plan will cost 55, 70, and 85 dollars per month.


at&t is less at 2, equal at 3 and more at 4.


any amount of use greater than 3 gigabytes of use will result in a smaller bill for verizon at these rates.