December 2019 1 20 Report
Resolva os sistemas pelo método da substituição
A) {x+y=11
{x-y=3
B) {x+y=6
{2x+y=4
C) {3x+y=5
{2x+y=4
D) {x-y=6
{x+y=-7
E) {x=5-3y
{2x-y=-4
F) {x-3=-y
{3x+2=y+3
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