Question

(4) Find the value of x + y, if 15x + 17y = 85 and 17x + 15y = 75.​

Answer 1

Answer:

Step-by-step explanation:

15x+17y=85 equation 1×15

17x+15y=75 equation 2 ×17

225x+255y=1275

289x+255y=1265

Subtract both equation we get value of x=-10/64

Put in equation we get y=5.13

Add x and y we get the required answers

Answer 2

very simple, here coefficients of x and y have interchanged in both the equations , so just add them and you will get the answer.