The slope-intercept form:

m - slope
b - y-intercept
We have the slope = 1.5 and y-intercept b = -3. Substitute:

Choose any value of x and calculate y:
for x = -2

for x = -1

for x = 0

for x = 1

for x=2

<h3>Answer: (-2, -6); (-1, -4.5); (0, -3); (1, -1.5); (2, 0)</h3>
Area of triangle = 1/2 bh
60 = 1/2 (15) h
8 = h
Quadrilateral area = h x (b1 + b2)/2 = 8 x (15+9)/2 = 96 sq units
96 -60 = triangle BAD area = 36 sq units
Check the picture below
so.. .if we use those 2 points, from the "best fit line"

I feel sorry for Becky and Tommy. The one who didn't come up with x=-10/3 made an error.
first bring 8x to the left and -25 to the right and simplify:
-4x-8x = 25+15 => -12x = 40
x = -40/12 = -10/3
The graph represents a parabola and a parabola is maximum or minimum at its vertex . So we need to check the graph , and find the point where the graph is maximum or minimum. And from the given graph , we can say that it is a downward up parabola which is minimum at its vertex . And the minimum point is (1.4). So the vertex is (1,4) .