23
172=x
5x+y=-7 3x+y=15 8=D
3x + 4 = 5x - 6 -3x -3x 4 = 2x - 6 +6 +6 10 = 2x 5 = x
5x - 5 = 3x - 9 add 5 to both sides: 5x =3x -4 subtract 3x from both sides: 2x = -4 Divide both sides by 2: x = -2
5x+2 = 3x-6 5x-3x = -6-2 2x = -8 x = -4
23
x = -8
3
3x+4 = 5x-6 3x-5x = -6-4 -2x = -10 x = 5
3x + 2x = 5x. 5x= (-4) X = (-4)/5 x= -0.8
3x-4=5x+6 gives: 2x=-10 which gives x=-5
172=x
5x+y=-7 3x+y=15 8=D
3x + 4 = 5x - 6 -3x -3x 4 = 2x - 6 +6 +6 10 = 2x 5 = x
5x - 5 = 3x - 9 add 5 to both sides: 5x =3x -4 subtract 3x from both sides: 2x = -4 Divide both sides by 2: x = -2
5x-2 = 3x-6 5x = 3x - 6 +2 5x = 3x - 4 5x - 3x = -4 2x = -4 x = -2