Equation thats driving me insane!

[Steve6443]

Start by transposing the X and Y.

therefore y=7-2x becomes

2x = 7 -y

(change the side, transpose the sign)

Then divide the result by 2 so it becomes

x = (7-y)/2

To confirm this, you can also check the result by using figures, for example I will consider x to be 2 such that 7 - 2X gives me a positive number. Based on this,

y = 7 - ( 2 x 2)

therefore

y=3

Now, I need a formula which, starting with 7, leads me with an answer 2.

So, if I subtract 3 from 7 and divide the answer by 2, I get the desired result.....

x = (7-y)/2