Question

Solve the simultaneous equations 7x+4y=17 3x+4y=5

Answer 1

Step-by-step explanation:

/ Solve equation [2] for the variable  y 

 

[2] 4y = -3x + 5 [2] y = -3x/4 + 5/4

// Plug this in for variable  y  in equation [1]

  [1] 7x + 4•(-3x/4+5/4) = 17   [1] 4x = 12

// Solve equation [1] for the variable  x 

  [1] 4x = 12    [1] x = 3 

// By now we know this much :

  x = 3   y = -3x/4+5/4

// Use the  x  value to solve for  y 

  y = -(3/4)(3)+5/4 = -1 

Answer 2

Solved by elimination method:- hope this is helpful.