The graph shows the number of lawns mark mowed over six weeks.

y = 20x

The graph passes through the origin , hence is of form

y = mx ( m is the slope )

to calculate m use the gradient formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁) = (2, 40) and (x₂, y₂) = (4, 80) ← 2 points on the graph

m = = = 20

y = 20x

part a

in a city ice cream is mostly only bought when the temperature is very high as ice cream cools down our

so we can derive the conclusion that as the temperature increases the number of ice creams sold also increases

part b

y intercept is 5

slope is 2

happy to

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