document.write( "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?
\n" ); document.write( "Step 1: Describe the above situation as a linear equation, using \"x\" or \"y\" as variable names to describe the unknown quantity.
\n" ); document.write( "Step 2: Solve for the unknown. \n" ); document.write( "
Algebra.Com's Answer #493528 by richwmiller(17219)\"\" \"About 
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(3,-1)
\n" ); document.write( "(7,-8)
\n" ); document.write( "y=mx+b
\n" ); document.write( "-1=3m+b
\n" ); document.write( "-1-3m=b\r
\n" ); document.write( "\n" ); document.write( "-8=7m+b
\n" ); document.write( "-8-7m=b
\n" ); document.write( "-1-3m=b
\n" ); document.write( "so
\n" ); document.write( "-8-7m=-1-3m
\n" ); document.write( "-7=4m
\n" ); document.write( "-7/4=m
\n" ); document.write( "b = 17/4, m = -7/4
\n" ); document.write( "y=-7/4x+17/4 slope intercept form
\n" ); document.write( "or
\n" ); document.write( "4y=-7x+17\r
\n" ); document.write( "\n" ); document.write( "solve for what unknown?\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
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