There is an older brother that is 4 and the younger brother is half the age.
the older brother turns 100 how old is the younger brother

Half of 100 is 50 the younger brother is 50 yrs old

98 because the older brother was 4 when the younger brother was 2, they only had 2 years of difference in age

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for