Question

Choose the system of equations that matches the following graph:

A) 5x+2y=-14
7x+y=7
B)5x+2y=-14
7x-y=7
C)5x-2y=-14
7x+y=7
D)5x-2y=-14
7x-y=7

Answer 1

@misty1212 @Nnesha

Answer 2

put the equations in the form y=mx+b

Answer 3

@10115658
@Hero
@nincompoop

Answer 4

get y by itself for the equations

Answer 5

and the y-intercept is -7 for both lines

Answer 6

I'm confused

@10115658

Answer 7

first i divide 7x from 7x+y=7 right
@10115658

Answer 8

nope, we just want to isolate y. so just subtract 7x

Answer 9

y=7-7x

Answer 10

y=-7x+7

Answer 11

what is the y-intercept of that?

Answer 12

and then i plug that in to the other equation?

Answer 13

no those are separate equations

Answer 14

for both the lines

Answer 15

what is the y-intercept of y=-7x+7

Answer 16

remember, the equation of a line is y=mx+b where m is the slope and b is the y-intercept

Answer 17

0,7

Answer 18

0,-7

Answer 19

ya it says the y-intercept is at 7. Looking at the graph though, that isn't true so we can rule out option A

Answer 20

lets look at 5x+2y=-14

Answer 21

we isolate y to get y = -5/2x - 7

Answer 22

this has a y-intercept of -7 which is true for both lines from the graph

Answer 23

looking at the graph, can you tell me what the x-intercepts are?

Answer 24

Where the lines cross the x-axis

Answer 25

-3
1

Answer 26

(0,-3) & (0,1)

Answer 27

that's right

Answer 28

so now we need to isolate x in the equation 5x+2y=-14 and see if the x-intercept is 1 or -3

Answer 29

so divide 5x

Answer 30

jk

Answer 31

ya you should get x = -14/5 -2y/5

Answer 32

oh ok jk again loll

Answer 33

So the x-intercept is -2.8 which is pretty much -3

Answer 34

So now we know 5x+2y=-14 is the equation of one of the lines

Answer 35

:-D

Answer 36

That means the answer must be either choice A or B

Answer 37

B

Answer 38

that's right

Answer 39

because A had -7 which was neither

Answer 40

Thanks man!

Answer 41

and if you find the x-intercept of 7x-y=7

Answer 42

you get x = 1 +y/7

Answer 43

1 being the x-intercept

Answer 44

no problem man

Answer 45

Keep in touch, you're a big help

Answer 46

Plus i see you like soccer

Answer 47

yep

Answer 48

you support a team?

Answer 49

to do it from the graph
the intersection is (0, -7)
in which option will this work for both equations?

Answer 50

when x = 0 is y = -7 D

Answer 51

Barca @10115658