document.write( "Question 1045382: What is the equation of the parabola determined by the given conditions: axis horizontal, vertex on Y-axis, and passing through (2,4) and (8,-2)? \n" ); document.write( "
Algebra.Com's Answer #660802 by josgarithmetic(39620)\"\" \"About 
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\"x=a%28y-k%29%5E2%2Bh\"-------basic standard form, if symmetry axis is horizontal\r
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\n" ); document.write( "\n" ); document.write( "\"x=a%28y-k%29%5E2\"--------- no displacement of vertex on x-axis because vertex ON THE y-AXIS\r
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\n" ); document.write( "\n" ); document.write( "\"a%28y-k%29%5E2=x\"
\n" ); document.write( "\"a=x%2F%28y-k%29%5E2\"\r
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\n" ); document.write( "\n" ); document.write( "\"system%28a=2%2F%284-k%29%5E2%2Ca=8%2F%28-2-k%29%5E2%29\"-------two given points used to form system; solve for a and k.
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