this question is not properly worded and is very difficult to answer
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We use line number in maths subject.
you put a dash where the correct number is.
You do not use a number line to find a ratio
line plot
are you kidding me?-9_-8_-7-6_-5_-4_-3_-2_-1_0_1_2_3_4_5_6_7_8_9there is your number line, go on from there.