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Can someone help and explain this?

Can someone help and explain this?-example-1
User Touv
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3 votes
x = 4

the line is parallel to y-axis, so the slope is infinity
User Kaushik Maheta
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4 votes
Well x=4 is vertical because the x axis is vertical but since they are both vertical that means they are parallel and when they are parallel that means that x=4 has an undefined slope
User Lidqy
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