Question

Con método de sustitución:

X-12y=1
-4x-9y=15

Answer 1

-4x -9y =15
-4x = 15 + 9y
x= 15 + 9y/-4

15 + 9y/4 -12y = 1
15 + 9y -12y = 1*4
9y -12y = 4 -15
-3y=-11
y=-11/-3
y= 3.66

x - 12(3.66) = 1
x= 43.92 + 1
x = 44.92

Answer 2

X=-35

Y=-3

Explicación paso a paso:

X=1+12y

-4x-9y=15

-4(1+12y)-9y=15

-4-48y-9y=15

-48y-9y=15+4

-57y=19

Y=-3