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2a + 6b = 24, 3a + b = 20

a + 3b = 12, a = 12 - 3b 3(12-3b) + b = 20 36-9b + b = 20 36-8b = 20 8b = 16 b = 2 2a + 12 = 24 2a = 12 a = 6
AC
Answered by Ailsa C. • Maths tutor
4562 Views

Factorise x^2 - 8x - 20

x^2 - 8x - 20 (x - 10)(x+2) (Explanation and helping understanding) Remember the last 2 numbers must multiply to equal the last number in the question and add together to equal the middle number. See that th...
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Answered by Christian S. • Maths tutor
4988 Views

Expand 5(2x-6)

To begin answering this question create a small grid put 5 on the left hand side and put 2x and -6 seperately at the top of the grid then you can multiply 5 by 2x to gain 10x and multiply 5 by -6 to gain -30...
ZY
Answered by Zaarah Y. • Maths tutor
8859 Views

Claire drove from Manchester to London, it took her 4 hours at an average speed of 85 km/h. Matt drove from Manchester to London, it took him 5 hours. Assuming he took the same route as Claire and took no breaks, work out his average speed in km/h.

Distance = 4 x 85 = 340km Average speed = 340 / 5 = 68 km/h
FH
Answered by Farhat H. • Maths tutor
3709 Views

Make b the subject of the formula a = 3 - 2b

So this question wants you to rearrange the formula so that b is on its own on one side of the equals sign. As its a formula and not asking for the value of the equation you don't have to worry about solving...
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Answered by Calum B. • Maths tutor
14766 Views