Question

The work of a student to solve a set of equations is shown below:

Equation 1: x + 2y = 10
Equation 2: 2x + 5y = 15


Step 1: −2(x + 2y) = −2(10)
2x + 5y = 15

Step 2: −2x − 4y = −10
2x + 5y = 15

Step 3: 1y = 5

Step 4: x + 2(1) = 10

Step 5: x = 8


In which step did the student first make an error?
Step 1
Step 2
Step 3
Step 4

Answer 1

Thanks

Answer 2

−2(10) != −10

Answer 3

step 1 ?

Answer 4

Thank you

Answer 5

Yeah a few more if your willing lol

Answer 6

kk hold on

Answer 7

Jill wants to solve the following system using the elimination method:

y = x + 8
y = 3x − 11

What number should the equation y = x + 8 be multiplied by to eliminate x?

−1
−2
−3
3

Answer 8

I got 3 for this am I right ?

Answer 9

ok

Answer 10

Maria wants to solve the following system using the elimination method:

4x + 9y = 59
x + y = 17

What number should the equation x + y = 17 be multiplied by to eliminate y?

4
−4
9
−9

Answer 11

lol

Answer 12

if you don't know it thats fine we can just go to the next question

Answer 13

A student is trying to solve the system of two equations given below:

Equation P: y + z = 4
Equation Q: 3y + 7z = 15

Which of the following steps can be used to eliminate the y term?

−3(y + z = 4)
3(y + z = 4)
−1(3y + 7z = 15)
−3(3y + 7z = 15)

Answer 14

last one i promise

Answer 15

I don't want to pressure you, you already helped a lot

Answer 16

lol thx

Answer 17

lol its fine. I know its really hard

Answer 18

yeah

Answer 19

yep

Answer 20

pre algebra

Answer 21

thats the american school system for ya lol

Answer 22

orange. you ?

Answer 23

I used to live there

Answer 24

lol yeah

Answer 25

8th

Answer 26

its that bad ?

Answer 27

I hope it gets easier for you.

Answer 28

lol me too

Answer 29

I agree. We should learn things that we actually have to deal with in the real world

Answer 30

right haha

Answer 31

im with you on that lol

Answer 32

nah my parents don't allow me to have social media

Answer 33

it sucks but I have a kik

Answer 34

thanks you too

Answer 35

depends on the person but yeah I guess

Answer 36

lol i wont

Answer 37

well you can always talk to me if you like. I used to be shy but when I got out of my shell more things got a whole lot easier

Answer 38

hold on I forgot the name let me check

Answer 39

its milalovesu0