Peaches are being sold for $2 per pound. if x represents the number of pounds of peaches bought and y represents the total cost of the peaches, which best describes the values of x and y?

the values of both x and y can be any real number.
the values of both x and y will be real numbers greater than or equal to 0.
the value of x can be any real number, but the value of y will always be a real number greater than or equal to 0.
the value of x can be any real number greater than or equal to 0, but the value of y must be an integer greater than or equal to 0.

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?