Respuesta :

twanp4enhr
So we use the form
[tex]y = mx + b[/tex]
Find b by looking at the start point, in this case: 110. So we have:
[tex]y = mx + 110[/tex]
Then, we see that it is a decreasing line, so we know that m < 0.
Filling in
[tex]x = 20[/tex]
Gives y = 70, so solve the (function) equation:
[tex]f(20) = 70[/tex]
[tex]20 \times m + 110 = 70[/tex]
[tex]20m + 110 = 70[/tex]
[tex]20m = - 40[/tex]
[tex]m = - 2[/tex]
Therefore the formula is:
[tex]n = - 2m + 110[/tex]
Or:
N = -2M+110 as I couldn't find capital letters :-(


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