1) Global climate change has affected mountain glaciers all over the world. At Cornwall Glacier on Mount Shasta in California, scientists have measured the retreat of the glacier from 1858 through 1994. The data from 1858-1994 is plotted on the graph below, using the location in 1994 as the 0 km point.2) Construct a best fit line through the data.3) Provide the final equation for your line.Show all of your work. Justify your answers. Global climate change has affected mountain glaciers all over the world. At Cornwall Glacier on Mount Shasta in California, scientists have measured the retreat of the glacier from 1858 through 1994. The data from 1858-1994 is plotted on the graph below, using the location in 1994 as the 0 km point.
Construct a best fit line through the data.
Provide the final equation for your line.The equation for a line is:
y = mx + b, where m is the slope and b is the y-intercept
m is calculated by taking the rise/run between two points
The line drawn above passes through point 1: (1960, 480) and point 2: (1980, 200), therefore,
m=(y2-y1)/(x2-x1)=(200-480)/(1980-1960)=(-280)/20=-14
The y-intercept, b, is calculated by putting on point (1980, 200) into the equation with the slope and solving for b:
200=-14*1980+b
200=-27720+b
b=27920
So, the equation for the line drawn above is:
y=-14x+27920




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