Verified Answer :

rhapsodyofwords
  1. 7x+15y=32
    2. x-3y=20/5
    2. 5x-15y=100
    1.+2.= >12x=132
                 x=11
    1. 7    11+15y=32
         15y= -45
            y= -3
    x=11;y=-3





eu99li

{7x+15y=32
{x-3y=20    /*5


{7x+15y=32

{ 5x-15y=100     (+)

7x+5x+15y-15y=32+100

12x=132    /:12

x=11

x-3y=20

11-3y=20    /-11

-3y=  9    /:(-3)

y=-3

The solution:  (11; -3)


Related Questions