document.write( "Question 547550: Determine whether the relation is a function: 8y = 7 + 3x \n" ); document.write( "

Algebra.Com's Answer #356936 by KMST(5328) $\"\"$ $\"About$

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You can solve for y and get $\"y=%283%2F8%29x%2B7%2F8\"$ which assigns just one y value to each x value, so it is a function.
\n" ); document.write( "The relation $\"x%5E2%2By%5E2=1\"$ is not a function because for $\"x=0\"$ there are two values for y: $\"y=1\"$ and $\"y=-1\"$ .
\n" ); document.write( "Another way of checking is looking at a graph and seeing if a vertical line could intersect the graph more than once.
\n" ); document.write( "The graph of $\"+8y+=+7+%2B+3x\"$ is a slanted line, so it's a function.
\n" ); document.write( "The graph of $\"x%5E2%2By%5E2=1\"$ is a circle, so you know it's not a function because a vertical line can cross the circle at two points. \n" ); document.write( "

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