document.write( "Question 602928: How do you graph x^2/81 + 4y/9 = 1 \n" ); document.write( "
Algebra.Com's Answer #380495 by ewatrrr(24785)\"\" \"About 
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document.write( "Hi,
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document.write( "How do you graph x^2/81 + 4y/9 = 1 
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document.write( "Solving for y = -(1/36)x^2 + 9/4\r
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document.write( "the vertex form of a parabola opening up or down:
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document.write( " \"y=a%28x-h%29%5E2+%2Bk\" where(h,k) is the vertex.
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document.write( "y = -(1/36)x^2 + 9/4  
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document.write( "a<0, parabola opens downward
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document.write( "Vertex is Pt(0,9/4) 
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document.write( "when y = 0, (1/36)x^2 = 9/4  and x^2 = 81 or x = ± 9
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