Question

If 8x-7y=11 and 7x-8y=4 then what is the value of x+y=?

Answer 1

The value of x+y is 7

Step-by-step explanation:

Equation 1: $8x-7y=11$

Equation 2: $7x-8y=4$

Plot the lines on graphs

8x-7y=11 --- Black line

7x-8y=4 --- Red line

Point of intersection gives the solution

So, Point of intersection = (4,3)

So, x = 4 and y = 3

So, x+y=4+3=7

Hence x+y is 7

#Learn more:

Solve for X and y 7x- 8y - 11 = 0 and 8x - 7y - 7 = 0

https://brainly.in/question/122656

Answer 2

Step-by-step explanation:

8x-7y=11

7x-8y=4

(x+y)?