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Q: What is 3x plus x plus 8 equals 20?

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3x + 8 = 20 - 3x 6x = 12 x = 2

8+7x = 20+3x 7x-3x = 20-8 4x = 12 x = 3

3x + 8 = 2x +28 3x - 2x = 28 - 8 x=20

11x + 8 = 8x + 20 3x + 8 = 20 3x = 12 x = 4

3x + 8 = 20 3x = 20 - 8 3x = 12 3x = 12/3 x = 4

2

68

645375

y=4x2+3x+8

add; 5x =20 so x = 4

3x+2y=20 5x-2y=1 (3x+2y) + (5x-2y)= 20+1 3x+5x= 21....... 8x=21.........x=2 5/8 Subsitute x=3(2 5/8)+ 2y=20........... 7 7/8 +2y=20.........2y= 20- 7 7/8....... y=6 1/16

3x+8 = 12 3x = 4 x = 4/3

4x + 5 = 3x + 84x-3x + 5 - 5 = 3x - 3x + 8 -5x = 3

3x-6y=-8

-3x + 6 + 15x =11x + 8 ie -3x + 15x - 11x = 8 - 6 ie x = 2

3x - 8 = 7 so x = 5

70000000y=35t

3x 11 5x=75 x=8

3x + 2x = 40 5x = 40 x = 8

(-2, 4)

-3x+2 = 2x-8 8+2 = 2x+3x 10 = 5x x = 2

7x-3=3x+8 7x-3x=8+3 4x=11 x=11/4=2.75

x=1.6225

3x = x+8 so 3x-x = 8 hence 2x = 8 and so x = 4

3x = -12 so x = -4