How do you find where the graph crosses the x-axis?

3 years ago

1 Reply

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Delaney Cassin

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1 Answer

Andrew B Verified Sherpa Tutor ✓

University lecturer in maths and statistics

When the graph crosses the x axis, the y value will be equal to 0. So you set the equation of the line equal to zero and solve for x.

For example, if we have the line y=3x+6

Set y=0 to give 3x+6=0 and solve for x:

3x=-6

x=-2

So the graph crosses the x axis at x=-2, which is the point (-2, 0)

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