Question

Y=2x+1 x+y=7 simultaneous linear equations

Answer 1

Step-by-step explanation:

given,

x+y=7*2

2x-y=-1

2x+2y=14

2x-y=-1

by subracting

3y=15

y=5

substitute y=5

x+y=7

x+5=7

x=2

x=2,y=5

Answer 2

Answer:

Solution of equations x = 2, y = 5  

Step-by-step explanation:

The given problem might be about finding the solution of the given simultaneous equations

Given simultaneous equations   $y =2x + 1$

                                                     $x+ y =7$  

the equations can be written as  $2x- y =-1$ _ (1)

                                                      $x+ y =7$ _ (2)

add (1) and (2) ⇒  $2x-y +x+y = -1 +7$  

                        ⇒  $3x = 6$  

                        ⇒  $x =2$

substitute  $x =2$  in (2)  ⇒   $x+y = 7$  

                                      ⇒   2 + y =7

                                       ⇒  $y = 7-2$

                                       ⇒ $y =5$  

solutions for the given equations  x = 2, y = 5