Question

A system of equations has 1 solution. If `4x-y=5` is one of the equations, which could be the other equation?

Answer 1

One possible other equation could be
`color(white)("XXX")y=-1`

Explanation:

`{(4x,-y," = ",5),(,color(white)(-)y," = ",-1):}`

has one solution `(x,y)=(1,-1)`

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Note that there are infinitely many possible solutions to this question.