40 is 20% of 160, so if she saved 40$ and it was 20% off then the original price was 160$!!!
Y=7 is just a straight horizonal line that is perpendicular to the y axis at 7
and y=1/2x+6, is in y=mx+b form where m=slope and b=yintercept so
to find the intersection, yo just find when both sentances are correct so
y=7
subsitute that into y=1/2x+6
7=1/2x+6
subtract 6 from both sides
1=1/2x
multiply both sides by 2
2=x
so the point (2,7) is the intersection
According to my calculations the 30% of 570 is 171
10% of 570 is 57
times that by 3 and you get 171
