Question

Solve the following pair of linear equations graphically 2x+3y=12 and x-y=1. Find the area of region bounded by the two lines representing the above equations and y axis. Which mathematical concept is used in the above problem.

Answer 1

2x+3y=12
x-y=1
multiplying second equation By 3 ...
2x+3y=12
3x-3y=3
addition algebraic expression
5x=15
x=5
By putting the value of x u can find value of y in any equation
5-y=1
y=5-1
y=4