Question

if 4x+3y=9 and 3x+4y=-8, then x-y=​

Answer 1

Answer:

anz is x-y=1

Step-by-step explanation:

using elimination method we get x valu and y valu

x=12/7

y=5/7

then x-y=12/7 - 5/7

=7/7=1

Answer 2

Step-by-step explanation:

Given -

• 4x + 3y = 9
• 3x + 4y = -8

To Find -

• Value of x - y

Now,

By Elimination method :-

⇝[ 4x + 3y = 9 ] × 3

[ 3x + 4y = -8 ] × 4

⇝12x + 9y = 27

12x + 16y = -32

(-) (-) (+)

_____________

⇝-7y = 59

⇝y = -59/7

Now,

Substituting the value of y on 4x + 3y = 9, we get :-

⇝4x + 3(-59/7) = 9

⇝4x = 9 + 177/7

⇝4x = 63 + 177/7

⇝28x = 240

⇝x = 60/7

Now,

The value of x - y is

⇝60/7 - (-59/7)

⇝60/7 + 59/7

⇝119/7

⇝17

Hence,

The value of x - y is 17.