Determine what the slope represent and the cost of a party for 40 people
The slope represent 8(cost per person) and y - intercept is 0
Equation of a straight line
y = mx + b
where,
m = slope of a line
b = y - intercept
y = total cost
x = number of people
Event 1:
Total cost = $120
Number of people = 15
y = mx + b
120 = m × 15 + 0
120 = 15m + 0
120 = 15m
m = 120/15
m = 8
Event 2:
Total cost = $120
Number of people = 15
- Cost of a party for 40 people
y = mx + b
y = (8 × 40) + 0
y = 320 + 0
y = $320
Therefore, the cost of a party for 40 people is $320
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