Question

if 3x+5y=9 and 6x+3y=7 then what is value of y=? A)2 B)16 C)9 D)7​

Answer 1

Answer⤵️

3x + 5y = 9 and 6x +3y = 7

3x + 5y = 9 } Multiplying by 2

6x + 10y = 18 ------------ ( 1 )

6x + 3y = 7 ------------- ( 2 )

Solve ( 1 ) and ( 2 ) equations

6x + 10y = 18

6x + 3y = 7

(-). (-). (-)

---------------------

0 7y = 11

y = 11/7

All the best :)

Answer 2

Step-by-step explanation:

3x+5y=9------(1)

6x+3y=7-------(2)

by equating coefficients,

multiply eqn 1×6

-----------//-----2×3

subtract eqn 3&4

18x+30y=54-------(3)

18x+9y=21 -------(4)

________________

21y=75

y=75/21

y=25/7