document.write( "Question 158073: Can someone help me with this one.
\n" ); document.write( "Determine whether the graphs of the equations are parallel lines, perpendicular lines or niether.
\n" ); document.write( "3x - 8y = -18
\n" ); document.write( "32x + 12y = -18
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Algebra.Com's Answer #116469 by Electrified_Levi(103)\"\" \"About 
You can put this solution on YOUR website!
Hi, Hope I can help,
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\n" ); document.write( "Can someone help me with this one.
\n" ); document.write( "Determine whether the graphs of the equations are parallel lines, perpendicular lines or niether.
\n" ); document.write( "\"+3x+-+8y+=+%28-18%29+\"
\n" ); document.write( "\"+32x+%2B+12y+=+%28-18%29+\"
\n" ); document.write( "Thank you!
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\n" ); document.write( "First we have to get the two lines in the slope intercept form,\"+y=mx%2Bb\" (\"m\" is the slope, \"b\" = y intercept)
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\n" ); document.write( "\"+3x+-+8y+=+-18+\"
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\n" ); document.write( "We will move (-8y) to the right side
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\n" ); document.write( "\"+3x+-+8y+=+-18+\" = \"+3x+-+8y+%2B+8y+=+-18+%2B+8y+\" = \"+3x+=+%28-18%29+%2B+8y+\"
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\n" ); document.write( "We will move (-18) to the left side
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\n" ); document.write( "\"+3x+=+%28-18%29+%2B+8y+\" = \"+3x+%2B+18+=+%28-18%29%2B18+%2B+8y+\" = \"+3x+%2B+18+=+8y+\"
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\n" ); document.write( "\"+3x+%2B+18+=+8y+\" = \"+8y+=+3x+%2B+18++\", To get it in slope intercept form, we have to divide each side by \"8\"
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\n" ); document.write( "\"+8y+=+3x+%2B+18++\" = \"+8y%2F8+=+%283x+%2B+18%29%2F8++\" = \"+y+=+%283x+%2B+18%29%2F8++\"
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\n" ); document.write( "\"+y+=+%283x+%2B+18%29%2F8++\" = \"+y+=+%283%2F8%29x+%2B+18%2F8++\" = \"+y+=+%283%2F8%29x+%2B+9%2F4++\"
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\n" ); document.write( "\"+y+=+%283%2F8%29x+%2B+9%2F4++\" is the slope intercept equation of \"+3x+-+8y+=+%28-18%29+\", we can check our answer by replacing \"x\" and \"y\" with any point on the line, in both of the different forms of equation
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\n" ); document.write( "We will use the points (-6,0)(x,y) and ( 2, 3)(x,y)( replace \"x\" with (-6), replace \"y\" with \"0\" for our first check, replace \"x\" with \"2\", replace \"y\" with \"3\" in our second check
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\n" ); document.write( "(-6,0), \"+3x+-+8y+=+%28-18%29+\" = \"+3%28-6%29+-+8%280%29+=+%28-18%29+\" = \"+%28-18%29+-+0+=+%28-18%29+\" = \"+%28-18%29+=+%28-18%29+\" (True)
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\n" ); document.write( "(-6,0), \"+y+=+%283%2F8%29x+%2B+9%2F4++\" = \"+0+=+%283%2F8%29%28-6%29+%2B+9%2F4++\" = \"+0+=+%28-18%2F8%29+%2B+9%2F4++\" = \"+0+=+%28-9%2F4%29+%2B+9%2F4++\" = \"+0+=+0+\" (True)
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\n" ); document.write( "Lets check with a different point
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\n" ); document.write( "(2,3) , \"+3x+-+8y+=+%28-18%29+\" = \"+3%282%29+-+8%283%29+=+%28-18%29+\" = \"+6+-+24+=+%28-18%29+\" = \"+%28-18%29+=+%28-18%29+\"(True)
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\n" ); document.write( "(2,3) , \"+y+=+%283%2F8%29x+%2B+9%2F4++\" = \"+3+=+%283%2F8%29%282%29+%2B+9%2F4++\" = \"+3+=+6%2F8+%2B+9%2F4++\" = \"+3+=+3%2F4+%2B+9%2F4++\" = \"+3+=+12%2F4++\" = \"+3+=+3+\" (True)
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\n" ); document.write( "\"+y+=+%283%2F8%29x+%2B+9%2F4++\" is our first answer
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\n" ); document.write( "Second equation (We are changing equation into slope intercept form \"+y+=+mx+%2B+b+\")
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\n" ); document.write( "\"+32x+%2B+12y+=+%28-18%29+\"
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\n" ); document.write( "We need to move \"32x\" to the right side
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\n" ); document.write( "\"+32x+%2B+12y+=+%28-18%29+\" = \"+32x+-+32x+%2B+12y+=+%28-18%29+-+32x+\" = \"+12y+=+%28-18%29+-+32x+\"
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\n" ); document.write( "\"+12y+=+%28-18%29+-+32x+\" = \"+12y+=+%28-32x%29+-+18++\", To get the equation in slope intercept form, we will divide each side by \"12\"
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\n" ); document.write( "\"+12y+=+%28-32x%29+-+18++\" = \"+12y%2F12+=+%28%28-32x%29+-+18%29%2F12++\" = \"+y+=+%28%28-32x%29+-+18%29%2F12++\" = \"+y+=+%28-32%2F12%29x+-+18%2F12++\"
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\n" ); document.write( "\"+y+=+%28-32%2F12%29x+-+18%2F12++\" = \"+y+=+%28-8%2F3%29x+-+3%2F2++\"
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\n" ); document.write( "The slope intercept form of the equation \"+32x+%2B+12y+=+%28-18%29+\" is \"+y+=+%28-8%2F3%29x+-+3%2F2++\"
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\n" ); document.write( "Lets check using two points again, Lets use (0, \"-3%2F2\") and (\"+-9%2F16\", 0)(We will do the first point first)
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\n" ); document.write( "(0, \"-3%2F2\"), \"+32x+%2B+12y+=+%28-18%29+\" = \"+32%280%29+%2B+12%28-3%2F2%29+=+%28-18%29+\" = \"+0+%2B+%28-18%29+=+%28-18%29+\" = \"+%28-18%29+=+%28-18%29+\" (True)
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\n" ); document.write( "(0, \"-3%2F2\"), \"+y+=+%28-8%2F3%29x+-+3%2F2++\" = \"+%28-3%2F2%29+=+%28-8%2F3%29%280%29+-+3%2F2++\" = \"+%28-3%2F2%29+=+0+-+3%2F2++\" = \"+%28-3%2F2%29+=+%28-+3%2F2%29++\" (True)
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\n" ); document.write( "Second check(second point)
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\n" ); document.write( "(\"+-9%2F16\", 0) , \"+32x+%2B+12y+=+%28-18%29+\" = \"+32%28-9%2F16%29+%2B+12%280%29+=+%28-18%29+\" = \"+%28-18%29+%2B+0+=+%28-18%29+\" = \"+%28-18%29++=+%28-18%29+\" (True)
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\n" ); document.write( "(\"+-9%2F16\", 0), \"+y+=+%28-8%2F3%29x+-+3%2F2++\" = \"+%280%29+=+%28-8%2F3%29%28-9%2F16%29+-+3%2F2++\" = \"+0+=+72%2F48+-+3%2F2++\" = \"+0+=+3%2F2+-+3%2F2++\" = \"+0+=+0+\" (True)
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\n" ); document.write( "\"+y+=+%28-8%2F3%29x+-+3%2F2++\" is our second answer.
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\n" ); document.write( "Our two equations in slope intercept form are
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\n" ); document.write( "\"+y+=+%283%2F8%29x+%2B+9%2F4++\"
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\n" ); document.write( "\"+y+=+%28-8%2F3%29x+-+3%2F2++\"
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\n" ); document.write( "The slope of the first line is \"+3%2F8+\", the slope of the second line is \"+%28-8%2F3%29+\"
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\n" ); document.write( "If two lines are parallel, their slopes would be the same(our lines are not parallel)
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\n" ); document.write( "If two lines are perpendicular, their slopes are the negative reciprocal of each other
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\n" ); document.write( "(examples of negative reciprocals: \"+%28-1%2F2%29+\" and \"+2+\", \"+%28-4%2F5%29+\" and \"+5%2F4+\", \"+%28-+4%29+\" and \"+1%2F4+\", to find the negative reciprocal of a number, switch the denominator and numerator with each other and add a negative sign)
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\n" ); document.write( "Our two lines are perpendicular, \"+%28-8%2F3%29+\" is the negative reciprocal of \"+3%2F8+\" ( the numbers to the right of the \"x\" \"+y+=+mx+%2B+b+\", Our \"b's\" don't have to be the same)
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\n" ); document.write( "Here are the two lines in a graph( lines are in slope-intercept form)
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\n" ); document.write( "\"+y+=+%283%2F8%29x+%2B+9%2F4++\" = green line
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\n" ); document.write( "\"+y+=+%28-8%2F3%29x+-+3%2F2++\" = red line
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\n" ); document.write( "As you can see the lines are perpendicular
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\n" ); document.write( "Hope I helped, Levi
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