Question

Find the value of x + y if 3x + 4y = -10 ; 4x + 3y = - 4​

Answer 1

Answer:

3x-4y=10_______(1)

4x-3y=4_______(2)

by multiplying eq 1 from 4

4(3x-4y)=4x10

12x-16y=40

by multiplying eq 2 from 3

3(4x-3y)=3x4

12x-9y=12

by subtracting both eq 1 and 2

12x-16y=40

- 12x-9y=12

___________

-7y=28

y= -28/7

y= -4

by putting the value of y in eq 1

3x-4x4=10

3x-16=10

3x=10+16

3x=26

x=26/3

by putting the value in (x-y)

-4-26/6

-24-26

6

-50/6

Step-by-step explanation:

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