(1) { x + 2y = 7 \n -2x + 5y = 4 } \n (2) { 4r + y = 9 \n -...

(1) { x + 2y = 7 \n -2x + 5y = 4 } \n (2) { 4r + y = 9 \n -3x + 2y = -4 } \n (3) { 3x + y = 7 \n 5x - 2y = 8 } \n (4) { x + 2y = 7 \n -2x + 5y = 4 } \n (5) { x + 2y = 7 \n 2x + 3y = 11 }

Resolva todos os sistemas abaixo.

$(1) { x + 2y = 7 \n -2x + 5y = 4 } \n (2) { 4r + y = 9 \n -3x + 2y = -4 } \n (3) { 3x + y = 7 \n 5x - 2y = 8 } \n (4) { x + 2y = 7 \n -2x + 5y = 4 } \n (5) { x + 2y = 7 \n 2x + 3y = 11 }$

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