The expression given can't be considered to be an equation because it doesn't have an equality sign.
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8b + 11 - 3b = 2b + 2 5b + 11 = 2b + 2 5b - 2b = 2 - 11 3b = -9 b = -3
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.
The straight line equation works out as: 3y = x
Equation of circle: (x-2)^2 +(y+9)^2 = 49