Grade 9 math · C.6 · Functions
Find the x-intercept of a line
Set y to zero and solve for x.
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Where does the line y = 2x − 16 cross the x-axis? Give the x-coordinate.
Answer: 8
Where does the line y = −4x − 24 cross the x-axis? Give the x-coordinate.
Answer: -6
Where does the line y = x − 4 cross the x-axis? Give the x-coordinate.
Answer: 4
Tip: Set y to zero and solve for x.
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