Question

Find b, if the point (2,b) lies on the line 4x - y = 5

Answer 1

4x - y = 5

here (2,b) x = 2
                 y = b
substitute the value of x (i.e.x=2) in 4x - y = 5
then, 4(2) - y = 5 
           8 - y = 5
           -y = 5 - 8
             -y= -3
minus(-) will cancel on both sides
then y= 3
        y = b then b = 3