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inna [77]
3 years ago
10

Solve the following system of equations. Express your answer as an ordered pair in the format (a,b), with no spaces between the

numbers or symbols
2x+7y=-1 and 4x-3y=-19
Mathematics
2 answers:
AVprozaik [17]3 years ago
7 0
Multiply the equation 2x+7y=-1 by -2

add to othe equaiton
4x-3y=-19
<u>-4x-14y=2 +</u>
0x-17y=-17

-17y=-17
divide both sides by -17
y=1

sub back
2x+7y=-1
2x+7(1)=-1
2x+7=-1
minus 7 from both sides
2x=-8
divide both sides by 2
x=-4

x=-4
y=1
(x,y) is normal form
(-4,1) is answer
zzz [600]3 years ago
7 0

Answer:

The answer is (-4,1)

Step-by-step explanation:

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Use
Tcecarenko [31]
So this in the exponential form of ab^x, where a is the y intercept, b is the growth factor(base) and x is your domain. From this, we can answer each question. The initial amount is 800, growth rate is 32% and factor is 1.32.


Happy learning!
6 0
2 years ago
The height of josie’s dog 11 1/4 inches to the nearest quarter inch and 11 inches to the nearest half inch.which measurement is
Lisa [10]
Both measurements are correct if you're rounding the dogs height.

But the more precise measurement would be 11 1/4.

Mainly because its a smaller fraction so it has more meaning to it instead of just plain 11

It would get more precise as the fraction got larger
For example.

Not very precise 
11, 11 1/2, 11 1/4,   

Precise
11 1/8, 11 1/16 

Hope this helps!
Brainliest is always appreciated if you feel its deserved!<span />
3 0
3 years ago
The time it takes a student to walk from the dorm to the chemistry lab follows roughly a Normaldistribution with a mean of 20 mi
creativ13 [48]

Answer:

95.15%

Step-by-step explanation:

We have that the mean (m) is equal to 20, the standard deviation (sd) 3

They ask us for P (x <25)

For this, the first thing is to calculate z, which is given by the following equation:

z = (x - m) / sd

We have all these values, replacing we have:

z = (25 - 20) / (3)

z = 1.66

With the normal distribution table (attached), we have that at that value, the probability is:

P (z <1.66) = 0.9515

Which means that the probability that it arrives before 25 minutes is 95.15%

6 0
3 years ago
Yesterday your bus ride to school took 10 minutes. Today your bus ride took 12 minutes. What is the percent of change?
Readme [11.4K]
The percent of increase from 10 to 12 is 20 %. 10 x 1.2 = 12.

Hope This Helps You!
<span>Good Luck Studying :)</span>
5 0
2 years ago
Read 2 more answers
How to do a equation with 60 less than j. Would label it as 60--j or j--60 ??
slavikrds [6]
J -60
-----------------------------------

3 0
2 years ago
Read 2 more answers
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