Question

resolva os sistemas de equacoes do 1 grau:
{2x+3y=8
5x-2y=1}

{2x-9y=-47
-x+20y=101}

Answer 1

Ola Anne

2x + 3y = 8
5x - 2y = 1

4x + 6y = 16
15x - 6y = 3

19x = 19
x = 1

2 + 3y = 8
3y = 6
y = 2

S = (1,2) 

2x - 9y = -47
-x + 20y = 101

2x - 9y = -47
-2x + 40y = 202

31y = 155 
y = 5

2x - 45 = -47
2x = -2 
x = -1 

S = (-1, 5)