Question

if 3x + 5y=9 and 5x+3y = 7
then what is the value of
x + y ?

options =
2
16
9
7​

Answer 1

Step-by-step explanation:

Here,

3x+5y= 9

3x= 9-5y

x= (9-5y)/3

putting the value of x in equation 2

5x+3y= 7

5(9-5y)/3 +3y= 7

45-25y+9y= 21

-16y= 21-45

-16y= -24

y= 24/16= 3/2

x= (9-5×3/2)/3= (18-15/2)/3= 3/2× 1/3= 1/2

x=1/2

y=3/2