2 years ago

Solve the simultaneous equations 3x + 2y = 30 3x - y = 21

Mathematics

1 answer:

Mrac [35]2 years ago

3 0

Answer:

x = 8 , y = 3

Step-by-step explanation:

3x + 2y = 30

3x - y = 21 -> y = 3x - 21

3x + 2 (3x - 21) = 30

3x + 6x - 42 = 30

3x + 6x = 30 + 42

9x = 72

x = 72/9 = 8

y = 3*8 - 21 = 24 - 21 = 3

∴ x = 8 & y = 3

You might be interested in

X^2y^4/z^3 / x^3z^2/y

Likurg_2 [28]

Answer: y3/xz

Step by step is provided in the screenshot below

6 0

2 years ago

Please help asap <3333333

SOVA2 [1]

Answer:

1: 75 degrees

2: 112 degrees

3: 125 degrees

4: 67 degrees

Step-by-step explanation:

4 0

2 years ago

IS 8.8 GREATER THAN 8.01

Tema [17]

Answer:

Yes, it is.

Step-by-step explanation:

The second 8 in 8.8 is greater than the 0 in 8.01.

6 0

2 years ago

Suppose set A is the set of all U.S. states and set B is the set of all U.S. cities which are state capitals. Now, suppose the r

yarga [219]

Answer:

Step-by-step explanation:

ghfgkjhydrk;l'klhh

8 0

2 years ago

Find what n equals 8(2n-2) = 4 - 4n (explanation please)

slavikrds [6]

Answer:

$\huge\boxed{n=1}$

Step-by-step explanation:

In order to find the value of n that satisfies this equation, we can perform a series of algebraic steps on it to solve for n.

$8(2n-2) = 4- 4n$
Distribute in the 8 on the left side:
$16n-16=4-4n$
Add 4n to both sides
$20n-16=4$
Add 16 to both sides
$20n = 20$
Divide both sides by 20
$n=1$

Therefore, n=1 is the value of n that satisfies this equation.

Hope this helped!

6 0

2 years ago

Read 2 more answers