Ways to solve Simultaneous Equations

First , 1(a) Solve the equations .
3(2x – 4) = 4(x 7)
(b) Beindu goes to the market to buy apples and bananas.
She can buy
7apples and 4bananas for 85cents
or
3 apples and 8 bananas for 93 cents.
Apple cost a cents each and bananas cost b cents each.
(i)This information can be used to write down 2 equations . One of these is 7a 4b = 85
write down the other equation .
(ii) Solve these two simultaneous equations on (b).(i) .
You must show all your working.