How do I find the y-intercept of an equation in the form #y = mx + b#?

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Answer 1 · 2014-07-23T17:57:38

In an equation of the form #y = mx + b#, the y-intercept is "#b#"

The y-intercept is the #y# value when #x# is 0. It is the point on the y-axis where the line crosses it.

Let's see this through an example. Let's look at the equation:

#y = 4x + 5#

Let's plug in 0 for x:

#y = 4*0 + 5#
#y = 0 + 5#
#y = 5#

Which is the same as the value of "#b#" in the original equation.