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3 years ago

What is the solution to this system of linear equations: y-x=4 and y+2x=1

1 answer:

5 0

-x + y = 4
2x + y = 1
 -3x = 3
 -3 -3
 x = -1
 -x + y = 4
-(-1) + y = 4
 1 + y = 4
 - 1 - 1
 y = 3
(x, y) = (-1, 3)

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Answer:

4 5/6

Step-by-step explanation:

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3 years ago

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zubka84 [21]

Answer:

$35\ ways$

Step-by-step explanation:

we know that

Combinations are a way to calculate the total outcomes of an event where order of the outcomes does not matter.

To calculate combinations, we will use the formula

$C(n,r)=\frac{n!}{r!(n-r)!}$

where

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r represents the number of items being chosen at a time.

In this problem

$n=7\\r=3$

substitute

$C(7,3)=\frac{7!}{3!(7-3)!}\\\\C(7,3)=\frac{7!}{3!(4)!}$

simplify

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3 years ago

Find the length of the curve y=3x^3/2 from x=0 to x=5/9

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3 years ago

The total cost of the tiles is £68 plus VAT the rate of VAT is 20% (b) work out 20% of £52

MArishka [77]

Answer:

a) 81-6

b) 10.4

Step-by-step explanation:

a) assuming that the VAT is 20% of the 68 pounds,

you calculate 120% of 68 (convert percentage to decimal)

= 1,20 * 68 = 81.6 pounds

calculate 20% of 68 pounds and add the answer to 68 pounds:

(0.2 * 68) + 68 = 81.6 pounds

b) 20% of 52

first convert the percentage to decimals:

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3 years ago