vale 99: me ajude a resolver:
7x-5y=6
-4x+3y=-4
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7x -5y =6 >>>> 7x= 5y +6 >>>>>> x=(5y +6) /7
-4x +3y = -4 ..... -4(5y +6)/7 + 3y = -4
(-20y - 24)/7 +3y =-4
-20y -24 +3y = -4 *7
-17y - 24 = -28
-17y = -28 + 24
-y= -4/17
y= 4/17
7x -5y =6
7x = 5y +6
7x= (5* 4/17) +6
17* 7x = 20 +6
119x = 26
x = 26/119
-4x +3y = -4 ..... -4(5y +6)/7 + 3y = -4
(-20y - 24)/7 +3y =-4
-20y -24 +3y = -4 *7
-17y - 24 = -28
-17y = -28 + 24
-y= -4/17
y= 4/17
7x -5y =6
7x = 5y +6
7x= (5* 4/17) +6
17* 7x = 20 +6
119x = 26
x = 26/119
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