Equations

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Messages: 1 - 8 of 8
• Message 1.

Posted by Livvy (U15617934) on Monday, 25th February 2013

some questions on my homework in not to sure what to do could you help thanks???
solve:
1/3x -(x-4) = 2

5-(2u-1) = 14 - 4u

• Message 2

, in reply to message 1.

Posted by Maths Teacher BBC (U15178780) on Monday, 25th February 2013

1/3x -(x-4) = 2
1/3 x - x + 4 = 2
-2/3 x = -2
-2x = -6
x = 3

5-(2u-1) = 14 - 4u
5 - 2u + 1 = 14 - 4u
6 - 2u = 14 - 4u
-2u + 4u = 14 - 6
2u = 8
u = 4

Hope this helps!!!

• Message 3

, in reply to message 2.

Posted by Livvy (U15617934) on Tuesday, 26th February 2013

hi
yeah thankss
4-(x+3)over 2 = 7

the x+3 is only over 2 not the 4

• Message 4

, in reply to message 2.

Posted by Livvy (U15617934) on Tuesday, 26th February 2013

2x^2 = 14X

• Message 5

, in reply to message 3.

Posted by Maths Teacher BBC (U15178780) on Wednesday, 27th February 2013

8/2 – (x+3)/2 = 7
8 – (x+3) all divided by 2 = 7
8 – (x+3) = 7x2
8 – (x + 3) = 14
8 – x - 3 = 14
5 – x = 14
-x = 14 – 5
-x = 9
x = -9

• Message 6

, in reply to message 4.

Posted by Maths Teacher BBC (U15178780) on Wednesday, 27th February 2013

2x² = 14x
2x² - 14x = 0
2x(x – 7) = 0

So 2 x = 0 therefore x = 0
(x – 7) = 0 therefore x = 7

• Message 7

, in reply to message 6.

Posted by HANA987 (U15577006) on Thursday, 14th March 2013

Naomi is painting her bedroom.
Its dimensions are 5.9m x 7.8m x 2.5m.
If a 2.5 litre tin of paint costs 12.50 and covers 16m squared,how much will it cost Naomi to put two coats of paint on her bedroom walls and ceiling?
(Ignore windows and doors)

• Message 8

, in reply to message 7.

Posted by Maths Teacher BBC (U15178780) on Saturday, 16th March 2013

If you think of it as a cuboid
Length = 5.9m
Height = 2.5m

Then you have the front wall = 5.9 x 2.5 = 14.75m²
The back wall will be = 5.9 x 2.5 = 14.75m²
The side wall will be = 7.8 x 2.5 = 19.5m²
The other side wall will be = 7.8 x 2.5 = 19.5m²

Total Area of all walls = 14.75 + 14.75 + 19.5 +19.5 = 68.5m²

1 tin covers 16m²
She needs to coat it twice so 68.5 x 2 = 137m²
So 137/16 = 8.5625 = 9 tins required
9 tins x £12.50 = £112.50

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