What is the slope of the line?

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

X+y=-4 x-y=2 use elimination with adding and subtraction