Question 76039
A=B+4 NOW SUBSTITUTE (B+4) FOR A IN THE FOLLOWING EQUATION & SOLVE FOR B
A*B=45
(B+4)B=45
B^2+4B-45=0
(B-5)(B+9)=0
B-5=0
B=5 ANSWER.
A=5+4
A=9 ANSWER
PROOF
9*5=45
45=45