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Solve the following simultaneous equation: x^2 + y^2 = 9 X+y=2

X 2.87 or -0.87y-0.87 or 2.87
RM
Answered by Ryan M. • Maths tutor
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Expand and simplify (x-5)(3x+3)

Begin by expanding brackets using FOIL (first, outer, inner, last) method (demonstrated on whiteboard to make clear). Multiplying the first term of each bracket gives 3x 2 , multiplying outer terms gives 3x,...
CJ
Answered by Christopher J. • Maths tutor
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How to solve a simultaneous equation?

2x+3y=7 ----(1)x-y=1 -----(2)First, look at how you can eliminate one of the unknowns. Here we can multiply the second equation by 3 to make eliminate the "3y" in the first equation. We will then h...
HS
Answered by Ho Sum W. • Maths tutor
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x : y = 7 : 4, x + y =88. Work out the value of x - y.

Here we use the ratios given to calculate the answer. First we sum add 7 and 4 to find total parts. 7 + 4 = 11. Then we divide 88 by 11. 88/11 = 8.This means we know that each part in the given ratio is 8.He...
AC
Answered by Alice C. • Maths tutor
5600 Views

Eleven pet owners were asked how many pets they had in total. The results are given below. 1, 1, 2, 3, 4, 5, 5, 6, 6, 6, 7 - Two more owners are asked how many pets they have. Including their results the mean goes down to 4 but the mode is unchanged from

1, 1, 2, 3, 4, 5, 5, 6, 6, 6, 7 - n=11mean = 46/11mode= most common so 6after n=13, mean is 413*4=52so 52-46=64 and 2 works1 and 5 not as mode changes3 and 3 not as mode changes
RJ
Answered by Rishi J. • Maths tutor
2150 Views