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There are n sweets in a bag, 6 are orange, the rest yellow. Two sweets are taken out individually without replacement. The probability of which is 1/3. show n²-n-90=0

Firstly, you need to consider the type of problem we are dealing with. This is actually just a tree diagram type question. note that the sweets are not replaced.

Letting n = number of swe...

JR
Answered by Joel R. • Maths tutor
4466 Views

There are n sweets in a bag. Six of the sweets are orange, the rest are yellow. One sweet is removed from the bag without replacement, then another is removed without replacement. Show that n²-n-90=0

Firstly, you need to consider the type of problem we are dealing with. This is actually just a tree diagram type question. note that the sweets are not replaced.

Letting n = number of swe...

JR
Answered by Joel R. • Maths tutor
4852 Views

Line AB has the equation 3x + 5y = 7. Find the gradient of Line AB.

Rearrange equation into the form: y = mx + c

m = gradient

3x + 5y = 7

5y = -3x + 7

y = (-3/5)x + (7/5)

gradient = (-3/5)

AN
Answered by Aaquib N. • Maths tutor
12822 Views

Solve the simultaneous equation: 2x + 3y = 6, 3x + 2y = 5.

1) 2x + 3y = 6

2) 3x + 2y = 5

We can either use substitution or elimination.

Using elimination:

Multiply equation 1) by 3 and multiply equation 2...

AN
Answered by Aaquib N. • Maths tutor
17694 Views

Solve the simultaneous equation: 3x+2y=8, 2x+5y=-2?

6x+4y=16, 6x+15y=-6

11y=-22

y=-2

3x=8+4=12  x=4

x=4, y=-2

TE
Answered by Thomas E. • Maths tutor
14570 Views

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