document.write( "Question 928065: A 100 ml cup of coffee costs 50. A 120 ml cup of coffee costs 70. How much would an 80 ml cup of coffee costs? I need help to get the equation and I need to graph it. \n" ); document.write( "
Algebra.Com's Answer #563430 by TimothyLamb(4379)\"\" \"About 
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(100,50) (120,70)
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\n" ); document.write( "slope = m = dy/dx
\n" ); document.write( "m = (50-70)/(100-120)
\n" ); document.write( "m = 1
\n" ); document.write( "---
\n" ); document.write( "y - 50 = 1(x - 100)
\n" ); document.write( "y - 50 = x - 100
\n" ); document.write( "y = x - 50
\n" ); document.write( "---
\n" ); document.write( "y-intercept = (0,-50)
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\n" ); document.write( "answer:
\n" ); document.write( "x = 80 ml
\n" ); document.write( "y = x - 50
\n" ); document.write( "y = 80 - 50
\n" ); document.write( "y = the cost of an 80 ml cup is 30
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