NAGALAND Class 10: Graphical Solution to Linear Equations Videos | Graphical Solution to Linear Equations

A linear pair of lines has no solution if the lines are parallel.

For ax + by + c = 0 and dx + ey + f = 0 to be parallel, the condition is  a/d = b/e ≠ c/e

Cost of x apples = 20x and cost of y oranges = 10y, so total cost = 20x + 10y

For ax + by + c = 0 and dx + ey + f = 0 to be overlapping, the condition is  a/d = b/e = c/e