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AleksAgata [21]
4 years ago
9

Solve the linear system by using substitution y=-3x-1 4x+3y=2

Mathematics
1 answer:
weeeeeb [17]4 years ago
5 0
4x+3(-3x-1)=2. This is gonna lead to x=-1 and y=2
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Solve the system of equations using elimination.
Dmitrij [34]

So just plug in the numbers (x,y) into the equations.

A) (7.5, -5)

2(7.5) -5 = 10

15 - 5 = 10 yup, this works.

Let's see if it works for other equation.

-2(7.5) + 2(-5) = 5

-15 - 10 = 5 nope, this does not work.

B) (-2.5, -5)

2(-2.5) - 5 = 10

-5 - 5 = 10 nope, doesn't work

Since it doesn't work we don't need to try for other equation.

C) (2.5, 5)

2(2.5) + 5 = 10

5 + 5 = 10 yup, this works.

Now the other equation.

-2(2.5) + 2(5) = 5

-5 + 10 = 5 and this works.

So the solution to this set is answer choice C

6 0
2 years ago
Plz plz plz plz help me
kifflom [539]
The colored sheets of paper will cost $1.25 and the package of stickers will cost $3.75. Together before sales tax her total is $5.00.
3 0
3 years ago
In colorado creek, darrell can row 24 km downstream in 6 hours or he can row 18 km upstream in the same amount of time. find the
frutty [35]
To answer this item, we let x and y be the rate of the boat in still water and current, respectively. The distance traveled by the object is equal to the product of the speed and the time. 

Upstream: 

             D = (x + y)(6)
             24 = 6x + 6y
             4 = x + y

Downstream:

               D = (x - y)(6)
              18 = 6x - 6y
               3 = x - y

The values of x and y are 3.5km/h and 0.5 km/h, respectively.

Answers: 

Rate in Still water = 3.5 km/h
Rate of the current = 0.5 km/h

7 0
4 years ago
An image of a target is shown. What is the value of x
KatRina [158]

Answer: before i can answer i need the image

7 0
3 years ago
f of x equals the quantity x minus one times the quantity x plus two times the quantity x plus four all divided by the quantity
Alik [6]
f(x)=\frac{(x-1)(x+2)(x+4)}{(x+1)(x-2)(x-4)}

The denominator of a fraction can't be equal to 0.
(x+1)(x-2)(x-4) \not= 0 \\
x+1 \not=0 \ \land \ x-2 \not= 0 \ \land \ x-4 \not= 0 \\
x \not= -1 \ \land \ x \not = 2 \ \land \ x \not= 4

The function is undefined at x=-1, x=2, x=4, because for these values the denominator of the function would equal 0, and it's impossible to divide by 0.

Edward is correct.
7 0
4 years ago
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