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2x + x + 4 +2x = x + 20 5x + 4 = x + 20 5x - x = 20 - 4 4x = 16 x = 4

Q: 2x plus x plus 4 plus 2x equals x plus 20?

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-2x = 20 + 5y-2x - 20 = 5y-2/5x - 4 = yX Intercept = (-10,0) or -10Y Intercept = (0,-4) or -4

x2+2x-4 = 0 x = (-2 plus/minus sqrt (4-(4x1x-4)) / 2 x = (-2 plus/minus sqrt 20)/2 x = (-2 - sqrt 20)/2 or (-2 + sqrt 20)/2 x = -3.236 or 1.236

1

2x^2 + 3x - 20 = 0 is 2x^2 + 8x - 5x -20 = 0 is 2x(x + 4) -5(x + 4) = 0 is (2x - 5)(x +4) = 0 Hence 2x -5 = 0 which gives x = 2.5 or x + 4 = 0 which gives x = -4

X = 180 - Y so 180 - Y = 2x + 4 and Y = 4x + 20 so 180 - 4x - 20 = 2x + 4 therefore 6x = 156 so x = 26 making Angle X = 56o and Angle Y = 124o

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8

-2x+20 = 3x 20 = 3x+2x 20 = 5x 4 = x So x = 4

2x+4 = -16 2x = -16-4 2x = -20 x = -10

2x + (10x - 4) = 20 2x + 10x - 4 = 20 12x - 4 = 20 12x = 24 x = 2

2x-4 = 20 2x = 20+4 2x = 24 x = 12

-2x = 20 + 5y-2x - 20 = 5y-2/5x - 4 = yX Intercept = (-10,0) or -10Y Intercept = (0,-4) or -4

If x=4 then 2x+7 =

x equals 4

y=16 x= -4

add; 5x =20 so x = 4

3x+56 = 2x+4 3x-2x = 4-56 x = -52

x+4+2x = x+20 x+2x-x = 20-4 3x = 16 x = 5 and 1/3