Question

Calcular o valor de X e Y no sistema 5x-4y=19
4x+3y=40

Answer 1

5x-4y=19(-4) 4x+3y=10(5) //////////////////////^ -20x+16y=-76. 20c+15y=50. -__________. 00x+31y=-26》y=-26/31》y=-0,84. /////////////////////////////////////////^^^^^^ 5x-4y=19》5x-4(-0,84)=19》5x+3,36=19》5x=19-3,36》5x=15,64》x=15,64/5》x=3,13