<PRE><B>Question 362123</B>
8x-10y=7
-10Y=-8X+7
Y=-8X/-10+7/-10
Y=4X/5-7/10 (RED LINE)
4x-5y=7
-5Y=-4X+7
Y=-4X/-5+7/-5
Y=4X/5-7/5 (GREEN LINE)
These are 2 parallel lines. Thus there is no unique solution for X or Y.
{{{ graph( 300, 200, -6, 5, -6, 5, 4x/5 -7/10, 4x/5 -7/5) }}} (graph 300x200 pixels, x from -6 to 5, y from -6 to 5, of TWO functions 4x/5 -7/10 and 4x/5 -7/5). 
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