Question

4x+5y=5 ; -10y-4x=-7 sustitución

Answer 1

Explicación paso a paso:

4x=5-5y

X=5-5y/4

(-1)-4x=-7+10y

4x=7-10y

X=7-10y/4

Sustitución.

(4) 5-5y= (4) 7-10y

20-20y= 28-40y

40y-20y= 28-20

20y= 8

Y= 8/20

Y= 2/5

X= 5-5(2/5)/4

X= 5-2/4

X= 3/4