Special triangles…how would I solve the rest of this??

Question 101 points)which equation in slope-intercept form represents the line that passes through (5, 1) and(-4,7)

Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable

Find the missing dimension! need asap! tiny square is a =3025 in ²