Solving for systems of equations by substitution.

y=4x
x+y=5

Since the first equation already gives you y, substitute Y for 4x in the second equation.
y=4x
x+y=5

x+(4x)=5
5x=5
x=1

Now that you know x, plug in x for 1 in the first equation.
y=4(1)
y=4
(1,4)

1935/10,000= 387/2000the answer to the question is c