Question

Find the y-intercept of the graph of 2x + 4y = 20.

Answer 1

2x + 4y = 20.
4x=20
Y=20/4=+5
(0,+5)

Answer 2

You did that kinda backwards

Answer 3

can you help fix it

Answer 4

To find the y-intercept, set x = 0, then solve for y:

2(0) + 4y = 20
4y = 20
y = 20/4
y = 5

(x,y) = (0,5) which means the y-intercept is 5.

Alternatively, put the equation in the form y = mx + b, where b = y-intercept:
2x + 4y = 20

Subtract 2x from both sides to get

4y =-2x + 20
Divide y by 4 to get
y = -.5x + 5

b = 5, therefore, the y-intercept is 5.