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Intercepts of Linear Equations  Concept
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
The x and yintercepts of a line, or linear equation intercepts, are often used in problems involving lines and their graphs. Linear equation intercepts are important points to be able to understand and decipher in applications of linear equations problems and can also be used when graphing lines. The yintercept is used when writing an equation in slopeintercept form.
X and Y intercepts are extremely
important in your study of math.
Before you can get into a good depth of
algebra, you really need to understand
the ideas of X and Y intercepts and
how to find them both from a graph
and from an equation.
So what I have here is just
like a really rough graph.
I just drew a line up there.
There's no numbers or anything.
But what I wanted to show you is that when
you're looking at a graph, you can
find the Y intercept by looking on the
Y axis and seeing where your line
crosses it. That's the Y intercept.
And the X intercept is here. It's where your graph
crosses the X axis.
I'm using int to abbreviate for intercept.
When you think about the coordinates of
this, on your Y intercept, it's going
to be 0 for X, because I'm going 0
side to side and then I'm going up
some number Y. I don't know what
that number is on this particular
graph. But your Y intercept is always when
X is equal to 0. So if all you had
was an equation you would substitute
X equals 0 in order to find your
Y intercept.
Similarly, the value of the coordinates
of the X intercept are going to be some
X value comma 0 for Y. So if I have
an equation and I'm asked to
find the X intercept, I would plug
in Y equals 0.
Before I leave you guys, I want to tell you about one
of the tricks with intercepts is
remembering that to find the X intercept
you'll get Y equals 0. To
find the Y intercept you'll get X
equals 0. It's kind of tricky
but if you can keep it straight in your
head I think you'll do fine on
these problems.
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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
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Sample Problems (6)
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Intercepts of Linear Equations
Problem 1 5,467 viewsFind the x and y intercepts of the given line.
x intercept:y intercept: 
Intercepts of Linear Equations
Problem 2 5,258 viewsFind the x and y intercepts of
2x + 3y = 12 
Intercepts of Linear Equations
Problem 3 3,995 viewsThe world population of cheetahs at the turn of the century was 100,000. By 1980 it was reduced to 25,000. Use the graph to predict when cheetahs will become extinct if the current rate of decline continues.

Intercepts of Linear Equations
Problem 4 398 views 
Intercepts of Linear Equations
Problem 5 422 views 
Intercepts of Linear Equations
Problem 6 374 views
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