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6x + 2y = 22, 2x + y = 8. Find x and y.

Times second equation by 2.6x + 2y = 22 4x + 2y = 16Cancel the y's to gain equation of just x's. 6x + 2y =22 4x + 2y = 16 - ------------------- 2x = 6 ; x = 3Substitute x into an equation.(2...

Answered by Jacob O. • Maths tutor

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How can you factorise quadratics with a an x^2 coefficient higher than one?

If we take an example question such as 20x² - 130 x = -20020x² - 130 x = -200 Divide by 10 to simplify2x² - 13x = -20 Take all of the terms to the left2x²- 13x...

Answered by Vahgisha T. • Maths tutor

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John bought 7 bags of cement and 3 bags of gravel with the total weight of 215kgs. Shona bought 5 bags of cement and 4 bags of gravel with the total weight of 200kgs. How much does 1 bag of cement weigh and how much does 1 bag of gravel weigh?

Step 1: Write down the information we got in a simplified form => cement (c) .... 7 bags .... 5 bags, gravel (g) ...... 3 bags .... 4 bags, total weight .. 215kgs ... ...

Answered by Jana V. • Maths tutor

5658 Views

Find x in: 2(x-2) = 3x+9

2(x-2) = 3x+9LHS = RHS2x-4 = 3x+92x-3x = 9+4-x = 13x = -13

Answered by Folorunso O. • Maths tutor

1828 Views

Expand and simplify: (x+7)(x+3)

This is a question that requires multiple steps, and in the exam may be worth around 3 marks. One will be for expanding, one for simplifying, and one mark for working.First step: expand the brackets. This...

Answered by Lily S. • Maths tutor

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