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3 years ago

-4y=-20x+40 y+10=5x

Mathematics

1 answer:

mart [117]3 years ago

8 0

Answer:

infinitely many solutions

Step-by-step explanation:

We want to find solution to the system:

-4y=-20x+40

y+10=5x

We make y the subject in the second equation to get;

y=5x-10

We substitute y=5x-10 into the top equation to get:

$- 4(5x - 10) = - 20x + 40$

We expand to obtain;

$- 20x + 40= - 20x + 40$

This implies that:

$40 = 40$

Therefore the system has infinitely many solutions.

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Yes or no easy math plus another math question

Fed [463]

Answer:

10 yes 18 no 17 no

Step-by-step explanation:

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3 0

2 years ago

Please help y - (-10) = 12 y = ______

kotykmax [81]

Subtracting a negative means that you will add the number. Convert the symbols to get the following:

y + 10 = 12

Subtract 10 from both sides.

y = 2

3 0

3 years ago

astra-53 [7]

Answer:

$c = 132$

Step-by-step explanation:

$c = 2\pi \: r \\ = 2 \times \frac{22}{7} \times 21 \\ = 132cm$

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brainliest appreciated

good luck! have a nice day!

7 0

3 years ago

Colin invests £3900 into his bank account.

zloy xaker [14]

Answer:

Colin will have 421824 pennies after 2 years

Step-by-step explanation:

Given:

Amount invested in bank by Colin (P) = £3900

Rate of interest (r) = 4%

Time period (n) = 2 years

To find: Amount after 2 years (A)

Solution:

Formula for amount (A) is $A=P\left ( 1+\frac{r}{100} \right )^n$

$A=3900\left ( 1+\frac{4}{100} \right )^2\\=3900\left ( 1+\frac{1}{25} \right )^2\\=3900\times \frac{26}{25}\times \frac{26}{25}\\=4218.24$

As 1 pound = 100 pennies,

4218.24 pounds = 4218.24 × 100 = 421824 pennies

So,

Colin will have 421824 pennies after 2 years.

4 0

3 years ago

Express jenny’s age in terms of a if jenny is three years less than half of Anne’s age.

hram777 [196]

Answer:

If Anne’s age is represented by the variable a then express Jenny’s age in terms of a if Jenny is three years less than half of Anne’s age

5 0

3 years ago