alleryStart learning →To find the x-intercept of a line from its equation, what value should be substituted for y before solving for x?
ALet y equal 1
BThe x-value itself
CThe constant term
DLet y equal 0
Answer & Solution
Correct answer: D. Let y equal 0
1. The x-intercept occurs at the exact point where the line crosses the x-axis.
2. Every point on the x-axis has a y-coordinate of 0, so setting y to 0 and solving for x finds that crossing point.
3. Substituting 1 or the constant term for y would not target the specific point where the line meets the x-axis.
_Source: OpenStax Prealgebra (CC BY 4.0), Ch 11 "Graphs", section 11.3 Graphing with Intercepts_
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