How to draw isoquant curves for a certain quantity?

A production isoquant is drawn on a graph with labor on one axis, capital on the other. Isoquants usually have a concave shape. The isoquant represents the mix of capital and labor that will produce a given, fixed level of output.

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.

Idon’t exactly understand but i think dbc=rst