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To find the x-intercept of a graph, which value is set to zero?
AThe value of x
BThe slope value
CThe input value
DThe value of y
Answer & Solution
Correct answer: D. The value of y
1. The x-intercept is the point where the graph crosses the x-axis.
2. Every point on the x-axis has a y-coordinate of 0.
3. So set y equal to zero and solve the equation for x.
_Source: OpenStax College Algebra (CC BY 4.0), section 2.1 The Rectangular Coordinate Systems and Graphs_