Number line

Find a number on the number line whose distance from the number 3 is four times smaller than from the number 15 (specify both solutions).

Correct answer:

a1 =  5.4
a2 =  -1

Step-by-step explanation:

a3=a15/4  a>15  (x3)=(x15)/4  3x=3  x=33=1  x=1  a<3;15>  a13=(15a1)/4  5a1=27  a1=527=5.4  a1=527=5.4
a<3  3a2=(15a2)/4  3a2=3  a2=33=1  a2=1

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