What does the y-intercept of a line of best fit mean

It means that you need to use slope intercept form, after calculating the mean of the x and y values.

A)26•2=52there are 2 sides with the same length116-52=64the other 2 side have to be half of 64 each64/2=32the width is 32b)make two sentences about these steps because your teacher knows how you write and explain things.