Question

Which number line can be used to find the distance between (4, –1) and (8, –1)?

Answer 1

$The \: points \:A(x_{1} , y_{1}) = ( 4 , - 1) \:and \\B(x_{2} , y_{1}) = ( 8 , - 1).$

$Since ,\: the \: y - coordinates\: are\:equal ,\\points \:lie \: on \: a \: line \: parallel \: to \: x-axis$

$Distance \: AB = | x_{2} - x_{1} | \\= | 8 - 4 | \\=4 \: units$

$\green { Here , we \: use \: X - axis \: to \:find }\\\green{ the \: distance \: between \: given \: two }\\\green { points }$

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