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.

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