Final answer:
To find the maximum width of the fence Brett can afford, divide his $490 budget by the $7 per foot cost of the fencing, which yields a maximum width of 70 feet.
Step-by-step explanation:
To calculate the maximum width that Brett can afford for his fence, we need to divide his budget by the cost per foot of the fencing material. The fencing costs $7 per foot, and Brett has a budget of $490.
The value of x, which represents the maximum width (in feet), can be found using the following equation:
x = Total Budget / Cost per foot
x = $490 / $7 per foot
x = 70 feet
Therefore, the value of x is 70 feet.