Answer:
1) When we have two points of a line (x1, y1) and (x2, y2), we can find the slope of a line that goes trough those points can be written as:
s = (y2 - y1)/(x2 - x1)
here we can use the points (-2, 1) and (4, -6)
s = (- 6 - 1)/(4 - (-2)) = -7/6
2) We have a discount of 35% (or 0.35 in decimal form), this means that if the regular price is r, the discount is:
d = 0.35*r
If the regular price is $85, then the new price is the regular price minus the discount:
Price = $85 - 0.35*$85 = $55.25
3) We have that the sum of all interior angles of a triangle always add up to 180°
Then the missing interior angle of the triangle is:
a = 180° - 72° - 36° = 72°
And we have that if we have a line, and other line that cuts it, two consecutive quadrants will add up to 180°.
Then it the angle next to x is 72°, the angle x is:
x = 180° - 72° = 108°