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Naddika [18.5K]
3 years ago
12

17. Solve the following: x – 3y = 5 5x – 2y = -1

Mathematics
1 answer:
Phantasy [73]3 years ago
8 0

Answer:

(- 1, - 2 )

Step-by-step explanation:

Given the 2 equations

x - 3y = 5 → (1)

5x - 2y = - 1 → (2)

Rearrange (1) expressing x in terms of y by adding 3y to both sides

x = 5 + 3y → (3)

Substitute x = 5 + 3y in (2)

5(5 + 3y) - 2y = - 1 ← distribute left side

25 + 15y - 2y = - 1

25 + 13y = - 1 ( subtract 25 from both sides )

13y = - 26 ( divide both sides by 13 )

y = - 2

Substitute y = - 2 in (3) for corresponding value of x

x = 5 + (3 × - 2) = 5 - 6 = - 1

Solution is (- 1, - 2 )

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Derek was 4 years 2 months old when he joined school. Today he is 11 years 1 month old. For how long has he been in school?
lora16 [44]

Answer:

hi

Step-by-step explanation:

first of all,we should do this:

1 year is 12 month

amd 4 year is 48 month(12×4)

then we must add 2 months (wich is given) to 48

He was 50 months old when he started school

and we should find how old is he now

11 ×12=132months

132+1=133months

133-50=83 ( he has been 83 months in school)

let's turn it to years 6 years 11 months

( for finding years you should divide 83 to 12)

hope it helps

6 0
2 years ago
CALC!! Please help me. For which pair of functions f(x) and g(x) below will the limit as x goes to infinity of the product of f
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First limit:
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Since we know that the first pair of functions does not approach 0, we do not have to check the others.
6 0
4 years ago
Q28. In a sale, the normal price of a book is reduced by 30%. The sale price of the book is £2.80 Work out the normal price of t
lisov135 [29]

Answer:

0.90

Step-by-step explanation:

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8 0
3 years ago
Can sombody help me??
Maksim231197 [3]

Answer:

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4 0
3 years ago
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A container shaped as a rectangular prism can hold 840 wooden cube blocks with edge lengths of
asambeis [7]
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Your answer should be: 105 ft.^3
4 0
3 years ago
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