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2 years ago

How to solve this system of equations ? 3x = y y + 7x = 10

Mathematics

2 answers:

earnstyle [38]2 years ago

7 0

Answer:

x = 10, y = 30

Step-by-step explanation:

Since this already has a y-value, which is 3x, we will use substitution.

3x + 7x = 10

10x = 10

x = 10

Now that we know x, we can figure out what y is.

y = 3(10)

y = 30

postnew [5]2 years ago

5 0

Answer:

x = 1, y = 3

Step-by-step explanation:

easy

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4. 9d - 5 = 4 What does d = 5. 6-3w=-27 what does w = 6. -4= q/8-19 what does q =

trapecia [35]

Answer:

4) d = 1

5) w = 11

6) q = 120

Step-by-step explanation:

4) $9d - 5 = 4$

Adding 5 on both the sides ,

$= > 9d - 5 + 5 = 4 + 5$

$= > 9d = 9$

Dividing both the sides by 9 ,

$= > \frac{9d}{9} = \frac{9}{9}$

$= > d = 1$

5) $6 - 3w = - 27$

Substracting 6 from both the sides ,

$6 - 3w - 6 = - 27 - 6$

$= > - 3w = - 33$

Dividing both the sides by -3 ,

$= > \frac{ - 3w}{ - 3} = \frac{ - 33}{ - 3}$

$= > w = 11$

6) $- 4 = \frac{q}{8} - 19$

Adding 19 on both the sides ,

$\frac{q}{8} - 19 + 19 = - 4 + 19$

$= > \frac{q}{8} = 15$

Multiplying both the sides by 8 ,

$= > \frac{q}{8} \times 8 = 15 \times 8$

$= > q = 120$

6 0

3 years ago

Germany has a population

egoroff_w [7]

Answer:

C. -186,205

Step-by-step explanation:

636,854 - 827,155 + 684,862 - 680,766

=> 1,321,716 - 1,507,921

=> -186,205

8 0

3 years ago

Use the quadratic formula to solve x2 + 2x - 120 = 0. Think about what other method could also be used to solve this equation. a

pshichka [43]

Answer:

x = 10 , -12

Step-by-step explanation:

Solution:-

- The given quadratic equation is to be solved using the quadratic formula. The general form of a quadratic equation is:

$ax^2 + bx + c =0$

Where, [ a , b and c are constants ]

- The quadratic formula is given as:

$x = \frac{-b+/-\sqrt{b^2 - 4*a*c} }{2a}$

- The given equation is:

$x^2 + 2x - 120 = 0$

Where, a = 1 , b = 2 , c = -120

- Solve using quadratic formula:

$x = \frac{-2+/-\sqrt{2^2 - 4*1*(-120)} }{2*1}\\\\x = \frac{-2+/-\sqrt{4 + 480} }{2}\\\\x = \frac{-2+/-(22) }{2}\\\\\\x = 10 , -12$

7 0

3 years ago

Justin is covering the outside of an open shoe box with colorful paper for a class project. The shoebox is 30 cm long, 20 cm wid

e-lub [12.9K]

Are you trying to find like the volume

5 0

3 years ago

Read 2 more answers

Multiplu (3/5) to the 3rd power

Colt1911 [192]

Answer:

27/125

Step-by-step explanation:

3/5 × 3/5 × 3/5

3×3×3 =27

5×5×5= 125

=27/125

5 0

3 years ago