Two equations are given by y = x2 – k and y = –2x - k. Regardless of the value of k, which of the following best describes the solution to the system of equations?

a. x=0
b. x=0 and x=2
c. x=0 and x=-2
d. no solution

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?