The 2 equations are -2x + y = -17 ---1) 3x + y = 23 ---2) we need to have the same coefficient for one of the variables. Already y variable has the coefficient of 1 for both equations so we can use the equations as it is. 2) - 1) subtract 1) from 2) 3x-(-2x) + y -y = 23-(-17) 5x = 40 x = 8 substituting x = 8 in the 2nd equation 3*8 + y = 23 24 + y = 23 y = -1
13 units from 20 could either be 33 or 7; 15 units from -8 could either be 7 or 23.Since 7 satisfy both of the above requirements, Sarah's favorite number is 7. (You could show your work using a number line)
The two possibilities of Neil's favorite number are 26 and -12.
