In each of 7 through 16, find the general solution of the given differential equation.4y+ 9y = 0

Definitions: Chapter 14.4-Double i ntegrals i olar orm 1)r x +y 2)x = osθ c 3)y = inθs Chapter 14.5-Applications of Multiple Integration 1) f σ(x,y)is ensity function f amina(thin-sheet) then he ass f he lamina can be given by ass ∫∫σ(x,y)dA Theorem: Chapter 14.4- double Integrals olar orm 1)∫∫ f(x,y)dydx = ∫∫ f(r,θ)rdrdθ R R 2) Area o f ∫∫ 1 * rdrdθ R 3) Proof for 1*r for Polar integrals. Consider the area of a sector: A = ½ r θ dA = r dr dθ NOTE: To decide rather to use cartesian or polar-graph the region Chapter 14.7-Triple Integr