12
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There are two ways to express this equation.
x-3y=9 is standard notation.
y=1/3 x-3 is slope intercept notation.
Both of these can be graphed with an intercept of (0,-3) and a slope of 1/3. It is an equation with an infinite number of solutions.
4xy + x3y + yx2 + yx + 3yx = x3y + x2y + 8xy = (xy)(x2y + x + 8)
9.
2, which equals 54. 3, which equals 36. 4, which equals 27. 6, which equals 18. 9, which equals 12. 12, which equals 9.
9 feet equals 3 yards.
12 plus 9 equals 21.