Question

9x-4y= -7 and 7x-12y= 39 find the value x and y ?​

Answer 1

Step-by-step explanation:

multiply 3 in first equation

27x-12y= -21

7x-12y= 39

sub both the equation

therefore

20x= -60

x= -3

put this value in any equation

y= -5

Answer 2

Answer:

X=-3

y=-5

Step-by-step explanation:

let 9x-4y=-7 be equation 1 and 7x-12y=39 be equation 2

From equation 1

9x=-7+4y

X=-7+4y/9_equation 3

put x value in equation 2

From eqa 2

7[-7+4y/9]-12y=39

-49+28y/9-12y/1=39

-49+28y-108y/9=39×9

-49+28y-108y=351

-49-80y=351

-80y=351+49

y=400/-80

y=-5

put y=-5 in equation 3

X=-7+4y/9

X=-7+4(-5)/9

X=-7-20/9

X=-27/9

X=-3