Given the variables $X$ and $Y$ which are correlated and jointly Bivariate with corresponding probability distribution function denoted by $f_{X,Y}(x,y)$, and given the linear relationship
$Z = a+\frac{b}{c}Y,\quad a,b,c\in\mathbb{R}$
How do I get the joint probability distribution $f_{X,Z}(x,z)$.