Question 820393: From 3 p.m. to 7 p.m., the temperature dropped by 7 degrees. If the temperature at 7 p.m. was -8 degrees, what was the temperature at 3 p.m. in degrees?
Step 1: Describe the above situation as a linear equation, using "x" or "y" as variable names to describe the unknown quantity.
Step 2: Solve for the unknown.
Answer by richwmiller(17219)   (Show Source):
You can put this solution on YOUR website! (3,-1)
(7,-8)
y=mx+b
-1=3m+b
-1-3m=b
-8=7m+b
-8-7m=b
-1-3m=b
so
-8-7m=-1-3m
-7=4m
-7/4=m
b = 17/4, m = -7/4
y=-7/4x+17/4 slope intercept form
or
4y=-7x+17
solve for what unknown?
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