420 - 60%= x 420= 60%

Option B is correct.

Step-by-step explanation:

Given Equation of lines are

y = x - 1 ...................(1)

y = 1/2x + 1 ...............(2)

To draw them on line, we find two points or solution of line.

Consider, line 1

put x = 0                                    

we get, y = 0 - 1 = -1                

Now, put x = 1

we get, y = 1 - 1 = 0  

So the required point of line 1 are ( 0 , -1 )  and ( 1 , 0 )

Consider, line 2

put x = 0                                    

we get, y = 0 + 1 = 1                

Now, put x = -2

we get, y = -1 + 1 = 0  

So the required point of line 2 are ( 0 , 1 )  and ( -2 , 0 )

Now we graph graph using obtained point.

Graph is attached.

Clearly from the graph, Point of intersection is ( 4 , 3 )

Therefore, Option B is correct.