OLBAPPRINCESSIN OLBAPPRINCESSIN Math Answered Evaluate the following expression for the given value of the variable.1. 7x + y if x=9 and y=42. 5a- 3 if a= 5 and b=33. 6x if x= 34. 8m + 7n - Sif m= 7,n=45. a-b if a= 10 and b= 2