Question

Solve simultaneous equation,
3x-y = 18
2x+y = 7

Answer 1

3x - y = 18
2x + y = 7
__________
5x = 25 
x = 5
y = 7 - 2(5)
   = 7 - 10
y = -3

Answer 2

Hiii friend,


3X -Y = 18........(1)




2X+ Y = 7......(2)


From equation (1) we get

3X= 18+Y


X= 18+Y/3.....(3)


Putting the value of X in equation (2)

2X + Y = 7


2 × (18+Y/3) + Y = 7

36 + 2Y/3+ Y= 7


36+2Y + 3Y = 21


5Y = 21-36

Y = -15/5 = -3


Putting the value Y In equation (3)

X= 18+Y/3. = 18 + (-3)/3 = 18-3/3 = 15/3 = 5



Hence,

X = 5 and Y = -3



HOPE IT WILL HELP YOU....... :-)