Q: 5x plus 20 equals 4x plus 30?

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If: 4x+(-12) = 8 then 4x = 20 and x = 5

4x + 4 = 20 4x = 16 x = 4

subtracting gives 4x = -12 so x = -3

x = 10

x=3

8x+30=4x+18 -4x -4x 4x+30=18 -30 -30 4x=-12 4x/4=-12/4 x=-3

3x + x + 8 = 204x + 8 = 204x = 12x = 3

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

2

4x-14

It looks like you have 2 simultaneous equations with 2 variables:4x + 8y = 20 and -4x + 2y = -30. Solution is {x=7, y = -1}.One way to solve:Add the two equations together, combining like terms: (4x - 4x) + (8y + 2y) = 20-30 --> 0 + 10y = -10 --> y = -1. Substitute this into either of the original equations and solve for x=7, then check in the other equation to make sure you calculated correctly.

x = 1 and y = 6 so the lines intersect at the point (1, 6)

24

4x =20x=20/4x=5

The answer to the problem of 13 equals -4x plus 9 is x equals -1.

Gosh... 4X plus 6 equals 30... This concludes to: 4X= 4 x X All you have to do is work back wards!!!! I'm only in year 6!! 30-6=24 Which mean 4 x X=24 X=6!!!!!!!!! =D

x=5.2

x = 3.75

4x + 2(3x) = 30 10x = 30 x= 3. Y= 9. (3,9)

(9,3)

Add 12 to each side: 4x + 6x = 20 ie 10x = 20 so x = 2

-4x + 4y = 1

4x-5y+20 = 0 -5y = -4x-20 y = 4/5x+4 which is now in slope intercept form

y = -2x+10

-20 = -4x +6 add 20 to both sides 0 = -4x +26 4x = 26 x = 26/4 = 6.5

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