Question

Solve the following simultaneous equations. 1). 2x-7y=7; 3x+y=22​

Answer 1

Answer:

x=7 y=1

Step-by-step explanation:

2x−7y=7 __(1)  , 3x+y=22×7

                               ⇒21x+7y=154 __(2)

Adding (1) and (2)

  2x−7y=7

21x+7y=154

______________

23x=161

x=7

2x−7y=7

2×7−7y=7

7y=14−7

y=1

∴x=7,

Answer 2

Answer:

x=7 y=1

Step-by-step explanation:

2x-7y=7 -(1)

3x+y=22 -(2)

equation (1)×3 and (2)=×2

6x-21y=21

6x+2y=44

-. -. -.

_________

-23y=-23

y=23÷23

y=1

substitute in 1

2x-7×1=7

2x=7+7

2x=14

x=14÷2

x=7