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Dimas [21]
1 year ago
6

Find value of 2x+2y if x+2y = 6 and x+y = 10

Mathematics
1 answer:
AleksAgata [21]1 year ago
5 0

Step-by-step explanation:

x + 2y = 6 \:  \: equ1 \\ x + y = 10 \:  \: equ2

From equ2,

x = 10 - y

Substituting the value of x in equ1,

(10 - y) + 2y = 6

Collect like terms

y=6-10

y = - 4

Substituting the value if y in equ2,

x+y=10

x+(-4)=10

x-4=10

x=10+4

x=14

Therefore, 2x+2y

2(14) + 2(-4)

28 - 8

=20

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8 0
3 years ago
Please answer asap will give the highest points possible
natali 33 [55]
Let cheese wafers = x
chocolate wafers = y

we know they bought 20 total packets so x+y = 20, this can be re-written as x = 20-y

cheese wafers cost 2, so we have 2x
chocolate wafers cost 1, so we have 1y, which is just the letter y

so we know 2x + y = $25

replace x with x=20-y to get:

2(20-y)+y = 25

distribute the parenthesis:

40-2y +y = 25

combine like to terms to get:
40-y = 25

subtract 40 from each side"
-y = -15

divide both sides by -1
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chocolate wafers was y so they bought 15 chocolate wafers
cheese wafers was x, so they bought 20-15 = 5 cheese wafers
 
using the substitution method was the easiest way to isolate one of the variables in order to find the solution.



6 0
3 years ago
Read 2 more answers
A laptop computer is purchased for $2000. After each year, the resale value decreases by 25%. What will the resale value be afte
wel

Answer:

2000? ... assume $2000

Resale Value = $2000*(1 - 0.25)t/yr

where: t = number of year after purchase

at t = 3 yr

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checking: at t = 0 $2000 (purchase price)

at t = 1 yr $2000 - 0.25*$2000 = $2000 - $500 = $1500

at t = 2 yr $1500 - 0.25*$1500 = $1500 - $375 = $1125

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8 0
3 years ago
18 is what percent of 60
Arisa [49]
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5 0
3 years ago
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If 20 machines produce 1,240 printers in a day,
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Step-by-step explanation:

The production rate per machine is 1240/20 = 62

For 1,984 printers it would take 32 machines (1984/62 = 32)

32 needed minus the 20 they already have means they need 12 more machines.

7 0
2 years ago
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