To find the four solutions of x = 4y we substitute different values for x and y

Let x = 0

Then,

x = 4y

0 = 4y

4y= 0

y = 0/4

y = 0

(0, 0)

Let x = 1

Then,

x = 4y

1 = 4y

4y = 1

y = 1/4

(1,1/4)

Let y = 4

Then,

x = 4y

x = 4 × 4

x = 16

(16, 4)

Let y =

Then,

x = 4y

x = 4×1

x = 4

(4, 1)

The solutions are (0,0), (1,1/4), (16,4), (4,1)