All categories

4 years ago

Solve the system by adding or subtracting x - 2y = - 13 5 x + 2y = -17

Mathematics

2 answers:

Delvig [45]4 years ago

5 0

You subtract and find x=10

vredina [299]4 years ago

5 0

Answer:

use the combination method

Step-by-step explanation:

x - 2y = -13

+ 5 x + 2y = -17

since 2y is in both equations you cancel them out.

5x + x = 6x

-2y + 2y = 0

-13 + (-17) = -30

put it back into the equation

6x + 0 = -30 or 6x = -30

6x ÷ 6 = x

-30 ÷ 6 = -5

x = -5

then plug into the equation x - 2y = -13 and 5x + 2y = -17

-5 - 2y = -13

-13 + 5 = -8

-2y = -8

y = 4

x = -5 and y = 4

You might be interested in

The probability distribution for the number of goals the Lions soccer team makes per game is given below.

UkoKoshka [18]

Answer:

The correct answer is:

(A) 0.55

Step-by-step explanation:

This probability distribution means that we have these following probabilities:

$P(X = 0) = 0.05$

$P(X = 1) = 0.15$

$P(X = 2) = 0.35$

$P(X = 3) = 0.30$

$P(X = 4) = 0.15$

What is the probability that in a given game the Lions do not score more than 2 goals?

This is the following probability.

$P = P(X = 0) + P(X = 1) + P(X = 2)$

$P = 0.05 + 0.15 + 0.35$

$P = 0.55$

The correct answer is:

(A) 0.55

3 0

3 years ago

I need help with the following questions

Law Incorporation [45]

Triangle sum is 180* which is 60+60+60

3 0

3 years ago

A jar contains 7 blue cubes, 4 blue spheres, 5 green cubes, and 6 green spheres. If you select an object at random, what is the

tia_tia [17]

The answer is A. 23/22.

The addition rule is used to calculate the probability of one of the events from multiple pathways. If you want that only one of the events happens (there is OR in a sentence), you will use the addition rule. So, let's just add the probability that the object is green and the probability that the object is a cube.
There are in total 22 objects:
<span>7 blue cubes + 4 blue spheres + 5 green cubes + 6 green spheres = 22 objects.
</span>The probability that the object is green is 11/22 (because there are 11 objects
that are green (5 cubes and 6 spheres) of in total 22 objects).
The probability that the object is a cube is 12/22 (because there are 12 objects that are a cube (7 blue and 5 green) of in total 22 objects).

Thus, the probability that the object is green or a cube is:
$\frac{11}{12} + \frac{12}{12} = \frac{11+12}{12} = \frac{23}{12}$

8 0

3 years ago

Andy, Brenda and Carla are running a race. in how many different ways can the students finish in first, second and third place

Bingel [31]

Let's call them A B and C.

ABC
ACB
BAC
BCA
CAB
CBA

so there's 6 different ways

7 0

3 years ago

PLS ANSWER!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

FinnZ [79.3K]

Answer: $1ft^{2}$

Step-by-step explanation: plz mark brainlies

6 0

3 years ago