determing if number is in row of matrix

I have a matrix that represents an interval and i also have a number (x). the first column of the matrix represents the beginning of the interval and the second one represents the end. my goal is to determine if the x is between any of the numbers of the matrix. how can i do that?

    matrix=[100 130;150 230; 250 270; 275 285; 290 315]
    x= 225

Answer 1

[KSSV]

matrix=[100 130;150 230; 250 270; 275 285; 290 315] 
x= 225 ;

idx = matrix(:,1)<=x & matrix(:,2)>=x 
iwant = matrix(idx,:)