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Question from an Edexcel GCSE Maths Higher Paper (Nov 2018) - Solve the simultaneous equations: 5x + y = 21, x-3y = 9 (3 marks)

So since there are two unknowns in this question, its slightly more difficult than a normal equation where we only have 1 x or y that we're trying to work out. There are two ways to deal with this type of si...
Answered by • Maths tutor
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Harry mixes white paint and blue paint in the ratio 2:5. He makes a total of 21 litres of paint. How much more blue paint does he need to add to the mixture so that the ratio of white paint to blue paint becomes 1:4?

W:B = 2:5 Total of 21 litres of paint. We want a ratio of W:B = 1:4 = 2:8 Therefore we must add 3 parts of blue paint 2 + 5 = 7 parts total7 parts = 21L1 part = 3L3 parts = 9L Therefore must add 9L of blue p...
JB
Answered by James B. • Maths tutor
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Calculate 3/4+3/4*5/7 ?

so we need to know the understanding of BODMAS, hoe to add fractions, how to multiply fractions, how to simplify fractions.Answer:9/7
AK
Answered by Anand K. • Maths tutor
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Find the stationery points of x^3 + 3x^2 - 24x + 7 and determine whether the slope is increasing or decreasing at x=3.

i) We must differentiate the equation and set it equal to 0 to find stationery points: dy/dx = 3x 2 + 6x + 24=0 Note we can take out a factor of 3 x 2 + 2x - 8=0 Factorise (x-2)(x+4)=0 State x values x=2 or ...
MM
Answered by Michael M. • Maths tutor
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Solve the simultaneous equations: x2 + y2 = 20, 3x=2-y

x = -4/5 or 2 y = 22/5 or -4
IA
Answered by Ishtiaq A. • Maths tutor
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