I think its b but i am not surely sure so you might want to check with someone else
No it isnt because you get <span>208519.454545</span>
Cancel out the terms from one side first then do it for the other one. 4 example make x and individual by multiply the other side by 9 the evaluate. do the same for y
let's plug the value of x and y as 5 and 4 respectively to find the value of given expression :