Question

If 5x + 3y = -3; 3x + 5y = 3. then the value of (x - y) is....​

Answer 1

Step-by-step explanation:

let 5x+3y+3=0 – equation 1

now multiply equation 1 with 3

15x+9y+9=0– equation 2

let 3x+5y-3=0 – equation 3

now multiply equation 3 with 5

15x+25y-15=0 – equation 4

now equation 4- equation 2

15x+25y-15=0

- (15x+9y+9)=0

16y-24=0

16y=24

y=24/16

y=3/2

put y=3/2 in equation 1

5x+3(3/2)+3=0

5x+9/2+3=0

(10x+9+6)/2=0

10x+15=0

10x=-15

X=-15/10

x=-3/2

there fore x-y=-3/2-3/2

x-y=-6/2

x-y=-3