the equations that will have only one solution are:
- 19x - 18 = -19x + 18 (option c)
- 19x + 18 = -19x + 18 (option d)
When we have only one solution?
An equation of the form:
a*x + b = c*x + d
Has one solution only if a ≠ c.
With that in mind, we can see that the equations that will have only one solution are:
19x - 18 = -19x + 18 (option c)
19x + 18 = -19x + 18 (option d)
In the other two cases, the slopes of the linear equations are equal, so these equations have no solutions or infinite solutions.
If you want to learn more about linear equations:
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