This statement is already nearly factored. The best we can do is pull out the 9 from each term:
9x + 9y + 72 = 9(x + y + 8)
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The slope is 0.
Pick any two numbers, x and y that are coprime. That is, they have no factor in common. Then GCF of 9x and 9y will be 9. Pick any two numbers, x and y that are coprime. That is, they have no factor in common. Then GCF of 9x and 9y will be 9. Pick any two numbers, x and y that are coprime. That is, they have no factor in common. Then GCF of 9x and 9y will be 9. Pick any two numbers, x and y that are coprime. That is, they have no factor in common. Then GCF of 9x and 9y will be 9.
It can be simplified to: 9y-2x
-7x+9y = 54 9y = 7x+54 y = 7/9x+6 which is now in slope-intercept form
57+9y=81y+12 45=72y 45/72=y