Respostas
respondido por:
1
A) {x+y=3
+{x-y=9
________
2x=12
x=12/2
x=6
6+y=3
y=3-6
y= -3
***************************************************************************
B) {2x-2y=12
+{ x+2y=11
__________
3x = 23
x= 23/3
23/3+2y=11
6y+23/3=11
6y+23=33
6y = 33-23
6y=10
y= 10/6
y=5/3
+{x-y=9
________
2x=12
x=12/2
x=6
6+y=3
y=3-6
y= -3
***************************************************************************
B) {2x-2y=12
+{ x+2y=11
__________
3x = 23
x= 23/3
23/3+2y=11
6y+23/3=11
6y+23=33
6y = 33-23
6y=10
y= 10/6
y=5/3
lala124123:
obra
Perguntas similares
6 anos atrás
6 anos atrás
9 anos atrás
9 anos atrás
9 anos atrás
9 anos atrás