Without an equality sign and not knowing the plus or minus values of some of the given terms it can't be considered to be an equation.
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An equation does not need variables. 4+5=9 is an equation as is 5+W=9
Assuming the point is (9, -4), the equation is y = -4.
Equation of circle: (x-2)^2 +(y+9)^2 = 49
The straight line equation works out as: 3y = x
The expression of y8x-9 has no solution because without an equality sign it can not be considered to be an equation.