12. (03.06 MC)
Write the equation of the line that passes through the points (1, 7) and (5, 15) using function notation. (5 points)

y = 2x + 5

y = 4x + 8

f(x) = 2x + 5

f(x) = 4x + 8

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?