Question

If 150+12y =21 and 17e + 15y = 11
then find the value of xty.​

Answer 1

Answer:

x + y = (- 2+3) = 1

Step-by-step explanation:

How do I solve the following sub equation 15x+17y=21 and 17x15y=11? What is the value of (x+y)?

15x + 17y = 21———(1)

And, 17x + 15y =11 - - - - - (2)

Now, adding the equations (1) and (2), we get - - -

15x +17y+17x+15y= 21+11=32

Or, 32 (x+y) =32

Or, x + y =1 - - - - - (3)

And, then, subtracting the equations (1) and (2),we also get——

15x + 17y - 17x - 15y = 21-11=10

Or, y - x = 5

Or, y = x+5 - - - - - (4)

Putting the value of y, in equation (3), we get - - -

x + x+5=1

Or, 2x = - 4

Or, x = - 2

And, y = (-2+5)=3

So, x + y = (- 2+3) = 1