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Math Help , Oh snap.

jspeicher

jspeicher

Golden Member
Residents are connected to a water supply and are billed a fixed amount yearly plus a charge for each cubic foot of water used.

A household using 1000 cubic feet is billed $90
A household using 1600 cubic feet is billed $105

a) What is charge per cubic foot?
The yearly charge would cancel since they are the same, so don't I just find the slope to find the charge per cubic foot?

b) Write an equation for the total cost of a resident's water as a function of cubic feet of water used.
This would be a linear line correct?

Don't need direct answers, just some help in the right direction.
 
These are two points on a graph.
X = cubic feet
Y = $

Draw the graph and see it visually.
Then find the appropriate formula to verify your visual results.

EDIT:
I was thinking more like
m = (Y2 - Y1) / (X2 - X1)

Y = mX + b

point-slope form
Y2 - Y1 = m * (X2 - X1)

but the two-equation style used by the others also works well.
 
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