All categories

2 years ago

3. Solve the system of equations using linear combination. a + c = 9 8a + 4.5c = 58

Mathematics

2 answers:

sergij07 [2.7K]2 years ago

7 0

A+c=9 so a=9-c
8(9-c)=72-8c+4.5c=58
12.5c=58-72
12.5c=-14
c=-1.12

lana66690 [7]2 years ago

5 0

Hey I have posted a picture the method I use to solve simultaneous equations is change the sign and follow the new sign.
This involves changing the sign for the second equation and solving it

You might be interested in

Find the length of AB?

vampirchik [111]

Given:

The figure of a right triangle.

To find:

The length of AB.

Solution:

In a right angle triangle,

$\cos \theta=\dfrac{Base}{Hypotenuse}$

Using this trigonometric ratio for the given triangle, we get

$\cos A=\dfrac{AB}{AC}$

$\cos (60^\circ)=\dfrac{AB}{10}$

$\dfrac{1}{2}=\dfrac{AB}{10}$

$\dfrac{1}{2}\times 10=AB$

$5=AB$

Therefore, the length of AB is 5 units.

7 0

3 years ago

Solve for homework :)

katrin2010 [14]

Answer:

$1) \frac{ {a}^{8} }{ {a}^{6} } \\ = {a}^{8} \times {a}^{ - 6} = {a}^{2} \\ 2) {m}^{2} {m}^{ - 4} = {m}^{ - 2} \\ thank \: you$

6 0

2 years ago

Read 2 more answers

TRUE or FALSE: In the quarter circle, the radius is 4 cm and the diameter is 8 cm.

viktelen [127]

Answer: False.

Step-by-step explanation:

There does not exist a "quarter circle" as a circle with a radius of 4 units, the only notable circle that does exist is the unit circle, that is the circle where the radius is equal to 1, represented by the equatin x^2 + y^2 = 1

The term "quarter circle" actually does refer to a fourth part of a circle, not to a circle of radius 4.

So the statement is false

6 0

2 years ago

The midpoint of RS is N(-4,1). One endpoint is S(0,-7). A) what are the coordinates of R B) what is the Length of RS to the near

lora16 [44]

A) The coordinates of R is (-8,9)
B) The length of RS to the nearest tenth of a unit is 17.9

5 0

2 years ago

What two numbers multiply to -42 but also add up to -11

spayn [35]

Answer:

-14 *3 and -14 + 3

Step-by-step explanation:

8 0

3 years ago