Question

Line M is represented by the following equation: x − y = 8

Which equation completes the system that is satisfied by the solution (18, 10)?

2x − y = 26
x + y = 18
2x − 2y = 36
x − y = −28

Answer 1

@angel_mejia

Answer 2

(18,10) tells us that x = 18 and y = 10

so, go through each answer choice one by one, and plug in x = 18 and y = 10, and see which one is true

Answer 3

c? @Vocaloid

Answer 4

nope, check your math again

Answer 5

b?

Answer 6

please do not guess, go through each answer choice one by one and plug in the numbers

Answer 7

start with the first choice:

2x − y = 26, true or false?

Answer 8

I'm having really hard time and have a huge time crunch

Answer 9

again, start with the first choice...

2x - y = ?

Answer 10

i don't even know where to start :c

Answer 11

x = 18
y = 10

2x = ?

Answer 12

36?

Answer 13

right, so 2x - y = ?

Answer 14

26

Answer 15

right.

the first choice says that 2x − y = 26, so this is our answer

Answer 16

thank u sm,can u do another plz?

Answer 17

sure

Answer 18

give me one sec

Answer 19

Line M is represented by the following equation: x + y = −1

What is most likely the equation for line P so the set of equations has infinitely many solutions?

2x + 2y = 2
2x + 2y = 4
2x + 2y = −2
x − y = 1

Answer 20

hint:

multiply x + y = -1 by 2 on both sides

Answer 21

im so confused ;c

Answer 22

just multiply everything by 2....

x + y = -1

Answer 23

so x+y=-1 multiplied by 2 would be 2x+2y=-2?

Answer 24

yes, and that's your answer

Answer 25

thank u! one more?

Answer 26

sure..

Answer 27

Two lines, A and B, are represented by the following equations:

Line A: y = x − 1
Line B: y = −3x + 11

Which of the following options shows the solution to the system of equations and explains why?

(3, 2), because the point does not lie on any axis
(3, 2), because one of the lines passes through this point
(3, 2), because the point lies between the two axes
(3, 2), because both lines pass through this point

Answer 28

hint: first multiply line A by 3

Answer 29

y=x -3?

Answer 30

@Vocaloid

Answer 31

not quite, you need to multiply EVERYTHING by 3

Answer 32

3y=3x-3

Answer 33

right, next step:

line A: 3y = 3x - 3
line B: y = -3x + 11

now add line A + line B

Answer 34

3y=0x+14

Answer 35

nope, check your math again...

3y + y = ?

Answer 36

im not sure

Answer 37

3y + y = __y

fill in the blank

Answer 38

4y

Answer 39

what does y equal?

Answer 40

we're about to find out!

now, when we add line A and line B together, we get 4y on the left side. and -3+11 on the right side.

so

4y = -3+11

Answer 41

-3+11 = ?

Answer 42

8

Answer 43

right.

so 4y = 8
what is y?

Answer 44

4?

Answer 45

4y = 8
divide both sides by 4, what do you get?

Answer 46

1,2

Answer 47

right, so we get y = 2

Answer 48

now we go to our second equation:

y = -3x + 11

now we plug in y = 2

2 = -3x + 11

what is x?

Answer 49

I'm sorry i have to go to lunch with my fan and this is my last question, can i plz just have the answer