Aparticular plant bears large-sized fruits. another variety of the same plant is resistant to pests. what process should be adopted to combine the traits of the two varieties of plants?
a) inbreeding
b) pure breeding
c) hybridization
d) line breeding

Hybridization is the process of interbreeding between the plants belonging to different species (interspecific hybridization) or genetically distinct individuals of same species (intraspecific hybridization). The offspring produce by this method is called as hybrid. The hybridization allows the breeding between parent plants that have desired characteristics, which results in production of hybrid having desired characteristics of both of the parents.

Therefore, in the given situation hybridization is the process that should be adopted to combine the traits of the two varieties of plants.

I deeply apologize if this is not what you meant.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)