A common test to find the genotype of a hybrid is by

Explanation

area of triangle`=1/2|[x_!,y_1,1],[x_2,y_2,1],[x_3,y_3,1]|`

`/_=1/2|[h,k,1],[5,3,1],[3,-2,1]|=9`

`/_=h(3+2)-k(5-3)+1(-10-9)=18`

`5h-2k-19=18`

`5h-2k=37`

putting h=x,k=y

`5x-2y=37`.