Question

Solve graphically x+y=5,2x+y=7​

Answer 1

(x,y) = (4,1)

Step-by-step explanation:

// Solve equation [1] for the variable  y 

 

[1] y = -x + 5

// Plug this in for variable  y  in equation [2]

  [2] 2x - (-x +5) = 7   [2] 3x = 12

// Solve equation [2] for the variable  x 

  [2] 3x = 12    [2] x = 4 

// By now we know this much :

  x = 4   y = -x+5

// Use the  x  value to solve for  y 

  y = -(4)+5 = 1 

Answer 2

Answer

x+y=5

x=5-y be equation 1

now substitute

2(5-y)=7

10-2y=7

-2y=7-10

-2y=-3

y=3

now substitute y=3 in 1

x+3=5

x=5-3

x=2