how to solve this

Question

width of the gap gets smaller.
16.8 millimeters wide at 10°C and decreases by
0.37Suppose that for some bridge the expansion gap is
millimeter for every 1°C rise in temperature.
56.
If the temperature is 18°C, by how many degrees did the temperature rise?
By how much would the width of the gap decrease? What would the new
width of the gap be? Round to the nearest tenth of a millimete

Answer 1

First set a point at (10, 16.8) and m = .375 and solve for b.

Then plug in 18 for x and solve for y

 

y = mx + b

16.8 = .375(10) + b

b = 13.05

 

y = (.375)18 + 13.05

y = 19.8mm