Someone please help And i need the equation.. 3a. The graph shows a school's profit P for selling x lunches on one day. PART A: What is the school's profit for selling 120 lunches?
School Lunches
Profit (dollars)
150
P
100
(65, 45)
50
(50, 0)
0
10 20 30 50 60 70 x
-50
100
(20,-90)
150
(0, -150)
-200
250
Number of lunches sold
Your answer

b

step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (3, - 5) ← 2 points on the line

m = = = - 3

with m = - 3 and (a, b) = (3, - 5), then

y - (- 5) = - 3(x - 3), that is

y + 5 = - 3(x - 3) → b