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.
Try elimination.4X + 13Y = 40- 1(4X + 3Y = - 40)4X + 13Y = 40- 4X - 3Y = 40-----------------------add10Y = 80Y = 8-------------find X ( top equation )4X + 13(8) = 404X + 104 = 404X = - 64X = - 16----------------------check in both equations for consistency4(- 16) + 13(8) = 40- 64 + 104 = 4040 = 40-------------top checks4(- 16) + 3(8) = - 40- 64 + 24 = - 40- 40 = - 40-------------------both check and are consistentSo, X is,- 16 ( while Y is 8 )
The expression of y8x-9 has no solution because without an equality sign it can not be considered to be an equation.
Equation of circle: (x-2)^2 +(y+9)^2 = 49