Question

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

Answer 1

Step-by-step explanation:

3x+ 5y = 9

5y = 9-3x

y = 9-3x/5

Put the value of y in 2nd equation.

5x+3y=7

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

5x + 27-9x/5 = 7

25x+27-9x = 35

16x = 8

x = 1/2.

y = (9-3/2)/5 = 3/2.

x+y = 1/2+3/2 = 4.

Answer 2

Answer:

By substitution

3x+5y=9rebeqngdnegnegnegnegnegn