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What form of equation produces a vertical line when graphed?
Ay equals a constant
Bx equals a constant
Cy equals a times x
Dx plus y equals a
Answer & Solution
Correct answer: B. x equals a constant
1. The definition states that a vertical line is the graph of an equation of the form x = a.
2. An equation of the form y = b instead produces a horizontal line.
3. An equation like y = ax or x + y = a still involves both variables changing together, which produces a slanted line, not a vertical 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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