Evaluate 4g - 12 when g=5

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

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?

Using elimination, what is -4x+2y=-12 4x+8y=-24