What is the y-intercept of the equation 4x + 5y = 20?

Remark
The y intercept is found by isolating y. Once you have y on (say) the left hand side of the equation, the y intercept is found by finding b in

y=mx + b

It is just read.

Solve.
4x + 5y = 20    Subtract 4x from both sides.
5y = 20 - 4x     Divide by 5
y = 20/5 - (4/5) x
y = 4 - (4/5)x

The y intercept is 4.

Edit
The y intercept is (0,4) It is a point.
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