x+y=9.0

0.50+0.20y=3.90

What is the valuse of x and y?

My mistake I meant

x+y=9.0

0.50x+0.20y=3.90

What is the value of x and y?

See your post above.

To find the values of x and y, we can solve the system of equations:

1) x + y = 9.0
2) 0.50 + 0.20y = 3.90

Let's start by solving equation 1) for x:

x = 9.0 - y

Now we can substitute this value of x in equation 2) to solve for y:

0.50 + 0.20y = 3.90

First, let's isolate the term with y by subtracting 0.50 from both sides:

0.20y = 3.90 - 0.50
0.20y = 3.40

Next, divide both sides by 0.20 to solve for y:

y = 3.40 / 0.20
y = 17

Now that we have the value of y, we can substitute it back into equation 1) to solve for x:

x = 9.0 - y
x = 9.0 - 17
x = -8

Therefore, the values of x and y are x = -8 and y = 17.