document.write( "Question 850770: I need help answering which of the following is the equation of a line that passes through (-2,-1)and (-4,-3) \n" ); document.write( "

Algebra.Com's Answer #512391 by rothauserc(4718) $\"\"$ $\"About$

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standard form for a line is y = mx +b where m is slope and b is y axis intercept
\n" ); document.write( "m is defined as change in y divided by change in x
\n" ); document.write( "using the two given points
\n" ); document.write( "m = (-3 - (-1)) / (-4 - (-2)) = -2 / -2 = 1
\n" ); document.write( "we can use the point (-2, -1) in the standard form to determine b
\n" ); document.write( "-1 = -2 +b
\n" ); document.write( "b = 1
\n" ); document.write( "therefore the equation of the required line is
\n" ); document.write( "y = x +1
\n" ); document.write( " \n" ); document.write( "

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