Question 1079566
Kim was born in the year 2000 and Jim was born two years later.
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Kim was age 0 in year 2000, and Jim, to be born in year 2002 is NEGATIVE TWO years of age, so not yet born in year 2000.  The best equation for x being Kim's age since year 2000 is  {{{x+(x-2)=100}}}.



The rest of this work below was wrong!
{{{cross(x+(x+2)=100)}}}
{{{cross(2x=98)}}}
{{{cross(x=49)}}}

<s>In year 2049, their ages will be  49 and 51.</s>
{{{cross(49+51=100)}}}