6. When solving for the value of x in the equation, Martha wrote the following lines on the board. Step 1 4(x - 1) + 3 = 18
Step 2 4(x - 1) = 15
Step 3 4x - 1 = 15
Step 4 4x = 16
Step 5 x = 4

Which property was used incorrectly when going from Step 2 to Step 3?

a. Addition Property of Equality
b. Distributive Property of Equality
c. Substitution Property of Equality
d. Transitive Property of Equality

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?