Решите систему уравнений способом сложения:
1) { x + 5y = 7
{ 3x - x = 1
2) { 2x + y = 9
{ 3x - 2y = 10
1) { x + 5y = 7
{ 3x - x = 1
2) { 2x + y = 9
{ 3x - 2y = 10
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1) { x + 5y = 7{ 3x - y = 1/*5⇒15x-5y=5
прибавим
16х=12
х=3/4
у=3*3/4-1=(9-4)/4=5/4
(3/4;5/4)
2) { 2x + y = 9/*2⇒4х+2у=18
{ 3x - 2y = 10
прибавим
7х=28
х=4
у=9-2*4=1
(4;1)