Question

:) If 17 x +35 y = 40 and 23 x + 17 y = 80, then x + y =​

Answer 1

Answer:

thereay be two answers or 2 values of can nd y for this question

Answer 2

Answer:

so $x + y = - 4.96$

Step-by-step explanation:

Given Linear Equation with two coefficients

            $17x + 35y = 40$

            $23x + 17y = 80$

We know by cross multiplication,

  $x = \frac{b_1 c_2 - b_2c_1}{a_1b_2 - a_2b_1}$

  $y = \frac{c_1a_2 - c_2a_1}{a_1b_2 - a_2b_1}$

in the given equation,

    $a_1 = 17 , b_1 = 35 , c_1 =  40$

      $a_2 = 23 , b_2 = 17 , c_2 =  80$

so  $x = \frac{35\times 80 - 17\times 40}{17\times17 - 23\times35}$

  $x =\frac{2800 - 680}{289 -805}$

   $x = -4.108$

and $y = \frac{40\times23 - 80\times17 }{17\times17 - 23\times35}$

      $y = \frac{920 - 1360 }{289 -805 }$

       $y = \frac{440} {- 516}$

    $y = -0.852$

Now , $x + y = - 4.108 - 0.852$

so $x + y = - 4.96$