Question 356811
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Hi,
Solution for 8x-9y=72  and x-y=4
graphing y = (8/9)x - 8  and y = x-4
reading the solution from the graph (-36, -40)
substitution verifies that solution
{{{ graph( 300, 300, -44, 44, -44, 44, (8/9)x-8, x-4) }}}