Please help will give the crown thing

On a piece of paper graph f(x)=5•(0.4)^x

16. you're planning to buy a boat, a motor, and some miscellaneous boating equipment. the boat costs $325, the motor costs $225, and the equipment costs $79. if you've saved $438 toward these purchases, how much more do you need to save? a. $181 b. $281 c. $291 d. $191

Solve 3x-18=2y and 5x-6y=6 by elimination show work