igualacion:
4x+y=17
-x+2y=-2
2y=-2+x/2
17-4x/2=-2+x/2
34-8x=-2+x
-9x=-36
x=-36/-9= 4
4.4+y=17
36+y=17
y=17-36=-19
sustitución.
x+3y=5
5x+2y=8
X=5-3y
5(5-3y) +2y =8
25-15y+2=8
-15y=8-2-25 -19/-15=
reduccion:
6x+8y=-14
5x-4y=-1
6x+8y=-14
10x-8y=-2
16x=-16
x=1
6x1+8y=-14
6+8y=-14
6+14= 8y
20=8y
20/8=5/2