Given y=x+4 and y=x^2 +4x, find x and y.

y=x+4 ...............(1)

...........(2)

plugging value of y from (1) in (2)

from here we get two values of x as

x-1=0, x=1 and x+4=0, x=-4

plugging x=1 in equation (1)

y=x+4 =1+4=5

plugging x=-4 in equation (1) , we get

y=x+4 =4-4 =0

so for x=1, y=5 and x=-4, y=0

x=1, y=5 and x=-4, y=5 points are (1,5) and (-4,5)