9 would be the first number and 7 would be the second.
Whats the problem? just substitute. For example: 3x-5 if x=4 so what you do is this; 3(4)-5=7
Answer:
A. 87
B. i dont uderstand velocily sorry
Step-by-step explanation:
3*a=3*17=51
4*b=4*9=36
51+36=87
It's the letter D hope it helps