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xenn [34]
3 years ago
9

— 3х + 9y = — 21 — 3х +8y = -18 find the solution by system of equations

Mathematics
2 answers:
Anvisha [2.4K]3 years ago
6 0

Answer:

x = -2

y = -3

Step-by-step explanation:

There are three methods for solving system of equations: elimination, substitution, and graphing. In this case elimination would be the best method since you have -3x for both equations. When solving by elimination, your goal is to eliminate one of the variables, in this case we will eliminate x. Subtract the bottom equation from the top (it is important to remember here that the negative will distribute to the entire equation).

-3х + 9y = -21

- (- 3х +8y = -18)

_____________

y = -3

Now plug this y-value in to either equation and solve for x

-3х + 9y = -21

-3х + 9(-3) = -21

-3x - 27 = -21

-3x = 6

x = -2

Check your answer by plugging both values in to the second equation

- 3х +8y = -18

- 3(-2) +8(-3) = -18

6 - 24 = -18

-18 = -18

Lesechka [4]3 years ago
5 0

Answer:

x=-2,y=-3

Step-by-step explanation:

x=7+3x

-3x+8y=-18

-21-y=-18

x=7+3x

y=-3

x=7+3x

x=-2

y=-3

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Two sailboats had a race. Sailboat A traveled 40 feet every 5 seconds, and sailboat B traveled 56 feet every 8 seconds. Which sa
Novosadov [1.4K]

Answer:

Sailboat A won the race, and it was going 8 feet per second.

Step-by-step explanation:

Sailboat A was traveling at 40 feet per every 5 seconds, so, to find how many feet it was going per second, we would do 40 feet/5 seconds, which is 8 feet.

Sailboat B was traveling at 56 feet per every 8 seconds, so we use the same method. 56 feet/8 seconds is 7 feet.

So, Sailboat A won because it was going faster! :)

6 0
2 years ago
Vocabulary Review List the five inequality symbols. Help me please
laiz [17]

Answer:

Greater than, less, than, equal to, greater or equal to, less than or equal to

Step-by-step explanation:

7 0
3 years ago
Find the slope (-3,10) (-3,7)
IgorC [24]

Answer:

Undefined because the x values are the same

Step-by-step explanation:

Slope: y2 - y1 / x2 - x1

Slope: 7 - 10 / -3 - - 3

Slope: -3 / -3 + 3

Slope: -3 / 0

Slope: undefined

8 0
3 years ago
What is the answer to this equation. -g+2(3+g)=-4(g+1)
Stells [14]

Answer:

The answer to the given equation -g+2(3+g)=-4(g+1) is g=-2

Step-by-step explanation:

Given -g+2(3+g)=-4(g+1)

To solve the given equation :

-g+2(3+g)=-4(g+1)

Applying the distributive property we get

-g+2(3)+2(g)=-4(g)+(-4)(1)

-g+6+2g=-4g-4

g+6=-4g-4 ( adding the like terms )

g+6-(-4g-4)=-4g-4-(-4g-4)

Applying the distributive property we get

g+6-(-4g)-(-4)=-4g-4-(-4g)-(-4)

g+6+4g+4=-4g-4+4g+4

5g+10=0 ( adding the like terms )

5g+10-10=0-10

5g=-10 ( adding the like terms )

g=-\frac{10}{5}

g=-2

Therefore g=-2

The answer to the given equation -g+2(3+g)=-4(g+1) is g=-2

4 0
4 years ago
I just want to go to bed so can someone help me with this question
user100 [1]

Answer:

A. 1

Step-by-step explanation:

Following order of operations, you would multiply 4/3 and 3/5.

Once you do this, you will get 12/15, which you can simplify to 4/5

Then you add the 1/5 with the 4/5 and you will get 5/5, which is equivalent to 1

7 0
3 years ago
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