Question

solve the equation 3x+y=13,2y-x=1​

Answer 1

Step-by-step explanation:

5x= 14

x= 14/5

put the value of x in (1)

3x+ y = 13

3×14/5 + y = 13

y= 13 - 42/5

= (65 - 42 ) /5

= 23/ 5

Answer 2

Answer:

x = 25/7 and y = 16/7

Step-by-step explanation:

3x + y = 13 --------(1)

2y - x = 1 ---------(2)

consider equation (2),

2y - x = 1

x = 2y - 1 ---------(3)

substitute equation (3) in equation (1),

3(2y - 1) + y = 13

6y - 3 + y = 13

7y - 3 = 13

7y = 16

y = 16/7

To find x now, substitute the above y value in equation (3)

you'll get → 2(16/7) - x = 1

32/7 - x = 1

x = 32/7 - 1.

therefore. x = 25/7