Question

find the value for 3x+4y=18,4x+3y=17 sum ​

Answer 1

Answer:

Step-by-step explanation:

The given equations are

3x+4y=18                              ...(i)

4x+3y=17                           ...(ii)

On multiplying (i) by 4 and (ii) by 3 and subtracting, we get

12x+16y=72

−

1

​

2x  

−

+

​

9y=  

−

5

​

1

​

 

          7y=21

⇒y=3

On putting y=3 in (i), we get

3x+12=18⇒3x=6⇒x=2

∴x=2,y=3