Write the form of the joint pdf of these jointly gaussian

Question

Two random variables are jointly Gaussian with means of μ_X=2, μ_Y=-3 variances of σ²_X=1, σ²_Y=4, and a covariance of Cov(X,Y)= -1.

(a) Write the form of the joint PDF of these jointly Gaussian random variables.

(b) Find the marginal PDFs f_X(x) and f_Y(y).

(c) Find Pr(X<0) and Pr(Y>0) and write both in terms of Q-functions.