i need help "its math problem"?

Question

as a kid ,if you had a 4inch long foot.you would wear a size 3 shoe if you hada 7 inch long foot,you would wear a size 12.
.write a linear eguation for the shoe size "S" as it depends upon foot length "L"?

what does the slope of the line represent?

once you are past 7 inch long foot.you move into adult sizes.for males. 8 inch long foot can wear an adult size 2.a 10 inch long foot would wear an adultsize 8..if shaquille O'neal wears a size 21 shoe,how long is his foot in inches?

Answer 1

Begin by plotting "inches" on one axis (x) and "size" on the other (y). Plot your two points and draw a line between them. Then figure out the slope-intercept equation. Y=mx + b or F(x) =ax + b (However your teacher showed you). X is slope. Slope is rise over run. So slope is "increase in shoe size PER each 1 inch increase in foot length" if you plotted on the axes I suggested. Figure out your slope by counting rise over run between your two points. Plug that value into your equation along with Shaq's shoe size and solve for Y (or F(x)).