Question

Find the solution of the pair of equations
3x – y = 5 and x + 2y = 4.​

Answer 1

Answer:

Equation I:-  2x+y=5

Equation II:-  x+2y=4

∴ We multiply Equation I by 2.

(2x+y=5)×(2)=(4x+2y=10)

We get equation III =4x+2y=10

Now, we subtract equation III & equation II.

(4x+2y=10)−(x+2y=4)

∴(4x−x)+(2y−2y)=(10−4)

∴(3x)+(0)=(6)

∴3x=6

∴x=36=2

We get x=2.

Now we substitute x=2  in equation II.

Equation II:-  x+2y=4

∴2+2y=4

∴2y=4−2

∴2y=2

∴y=2/2

∴y=1

Solving given equations, we get : x=2,y=1.

Thus, (a) is true.

Step-by-step explanation:

HOPE MY ANSWERS HELPS U IF U HAD PLZZZ BRAINLIST ME AND FOLLOW ME

Answer 2

Answer:

x=2

y=1

Step-by-step explanation:

3x-y=5........... 1

x+2y=4.......... 2

from 1

3x-y=5

x=5+y/3........... 3

putting value of x in 2

x+2y=4

5+y/3+2y=4

5+y+6y/3=4

5+7y=4×3

7y=12-5

7y=7

y=1

putting value of y in 1

3x-y=5

3x-1=5

3x=5+1

3x=6

x=2