Answer:
D.13
Step-by-step explanation:
g(3) = 4(3) + 1 = 12 + 1 = 13
£840 - 100%
100%-5%=95%
840*95%:100% = 798 (£) - <span>the number sought</span>
Solve both equations for y:

Set the expressions equal to each other:

So, for every nonzero number a the system of equations has
one solution.