Question

5v+6u =18
5v +7u =9

Answer 1

find ans of u and v

Answer 2

Write it like this:
5v + 7u = 9
5v + 6u = 18

Then subtract the second equation from the first:

(5v - 5v) + (7u - 6u) = (9 - 18)

Answer 3

You should be able to find the value of u. After you obtain that value, substitute it in to one of the original equations to find v.

Answer 4

you can also solve for one variable by making the equation v=(-7u+9)/5 and then plug that equation in for V in the second equation given... its called substitution