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What form of equation produces a horizontal line when graphed?
Ax equals a constant
By equals a times x
Cy equals a constant
Dx plus y equals a
Answer & Solution
Correct answer: C. y equals a constant
1. The definition states that a horizontal line is the graph of an equation of the form y = b.
2. An equation of the form x = a instead produces a vertical line.
3. An equation like y = ax or x + y = a still involves both variables changing together, which produces a slanted line, not a horizontal one.
_Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 4 "Graphs", section 4.2 Graph Linear Equations in Two Variables_
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