Let us draw the graph of the three equations x = 4, y = 3 and 3x + 4y = 12 and determine the area of the triangle formed by the graph.
0.y + 1.x = 4
Y could be anything because coefficient of y is zero. X has to be 4.
Similarly for y = 3
3x + 4y = 12
As we can see here The Triangle is Right angle triangle So we need base and Height.
Base = 4 units, Height = 3 units
Area = 
Area = 6 unit2
11