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3 years ago

Solve 3x + y = -5 -2x + 3y = 18 with the substitution method PLEASE HELPPPP

Mathematics

1 answer:

valina [46]3 years ago

5 0

Hey! Great to see you again.

Based on what we learned last time, we can apply it to this equation!

Solve 3x+y =−5 for y:

3x+y=−5

3x+y+−3x=−5+−3x Let us add -3x to both sides.

y=−3x−5.

Substitute −3x−5 for y in −2x+3y=18:

−2x+3y=18

−2x+3(−3x−5)=18

−11x−15=18 Simplify both sides :)

−11x−15+15=18+15 Add 15 to each side.

−11x=33

x = -3

Now solve for y.

−3 for x in y=−3x−5:

y=(−3)(−3)−5

Can you solve this equation? Let me know if you need help, tell me what you get! :) That will be your y answer. :D

Have a great one!

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Pamela babysits for a family down the street. She earns $25 each time she visits. Write an expression that could be used to find

fgiga [73]

I believe it is 25 b or 25 times b

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3 years ago

Brian spins a fair spinner numbered 1 - 5 and flips a fair coin.

Greeley [361]

Answer: 0.1

Step-by-step explanation:

If we spin a fair spinner numbered 1 - 5 and flips a fair coin.

Then, the possible outcomes will be :-

$(1,T),(2,T), (3,T), (4,T), (5,T)\\\\(1,H),(2,H), (3,H), (4,H), (5,H)$

i.e. total 10 possible outcomes.

The favorable outcomes = a 2 and a head i.e. only 1 .

Now, the probability of obtaining a 2 and a head will be :_

$\dfrac{\text{Number of favorable outcome}}{\text{Total outcomes}}\\\\=\dfrac{1}{10}=0.1$

Hence, the probability of obtaining a 2 and a head = 0.1

7 0

3 years ago

1.) You are the crew chief of the Algebra 2 formula racing team. Your current task is to

s344n2d4d5 [400]

Answer:

a). Mileage for carA= $\frac{2}{x}$ , and mileage for carB= $\frac{ 3x+2}{x(x+1)}$

b).total mileage for both is similar to average of them= $\frac{(mileageA + mileageB)}{2}$

= $\frac{5x+4}{2x(x+1)}[tex]mil/gal$

Step-by-step explanation:

It is given that the distance traveled by car $A=2x+2=2(x+1)$

And distance traveled by car $B= 3x+2$

We know the mileage is mile/gallon,

a).So mileage of car $A= \frac{distance traveled by car A}{gallos of fuel used}$

$=\frac{2x+2}{x^2 +x}\\ =\frac{2(x+1)}{x(x+1)} \\=\frac{2}{x}mil/gal$

Similarly , the mileage for car $B= \frac{distance traveled by car A}{gallons of fuel used}$

$=\frac{3x+2}{x^2+x} \\=\frac{3x+2}{x(x+1)}$ $mil/gal$

b).total mileage for both is similar to average of them= $\frac{(mileageA + mileageB)}{2}$

$=\frac{2x+2}{x(x+1)}+\frac{3x+2}{x(x+1)}\\ =\frac{2x+2+3x+2}{x(x+1)}\\=\frac{5x+4}{x(x+1)}mil/gal$

Now divide by 2 for total(average) mileage.

$\frac{\frac{5x+4}{x(x+1)} }{2}\\ =\frac{5x+4}{2x(x+1)} mil/gal$ .

Thus those are the answers.

4 0

3 years ago

The difference between nine times number and thirty

svetlana [45]

9x-30 I’m pretty sure!
We are finding the difference, which means subtract! Nine times a number would be 9x and since it’s difference you would subtract it by 30.

3 0

3 years ago

On average, water flows over a particular water fall at a rate of 2.08 x 105 cubic feet per second. One cubic foot of water weig

34kurt

Answer:

5.61×10^8 ton/day

Step-by-step explanation:

(2.08×10^5 ft³/s)·(8.64×10^4 s/day)·(6.24×10^1 lb/ft³)/(2×10^3 lb/ton)

= (2.08·8.64·6.24/2)×10^(5+4+1-3) ton/day

≈ 56.07×10^7 ton/day

≈ 5.61×10^8 ton/day

_____

We have expressed the answer using 3 significant digits, to match the precision of the rate and weight.

4 0

3 years ago