Question

Check my answer plz!?

Answer 1

The coordinates below represent two linear equations. How many solutions does this system of equations have?

Line 1
x y
-4 8
4 6
Line 2
x y
-1 1
3 5


A.
0

B.
exactly 1

C.
exactly 2<<I think its this one

D.
infinitely many

Answer 2

it is a system of (linear) equations. And their slopes are not parallel.
line 1) (8-6)/(-4-4) = 2/-8 = -1/4
line 2) (1-5)/(-1-3)=-4/-4=1

And (usually) 2 non-paralle lines would intersect only once.

Answer 3

2 non-parallel* line, apologize for the mistake.

Answer 4

Its ok so I was wrong? It would be B

Answer 5

Yup, it's B.

Answer 6

Thx can u check 2 more plz?

Answer 7

and if lines are parallel, then only would it be no solutions. And if the equations (in a system) are multiples of each other, then only will there be an infinite number of solutions.

Answer 8

but I don't think 2 linear equations can have 2 solutions exactly.

Answer 9

Yes, I can check 2 more.

Answer 10

Complete the equations of the system in slope-intercept form. Use a decimal for the slope if necessary.

Line 1
x y
0 3
1 5
Line 2
x y
-1 1
-2 -1

Line 1: y = ?x + ?
Line 2: y = ?x +?

Answer 11

Line1: y=3x+4
Line2: y=2x+-1

Answer 12

syntax error. never write +- like this.
do +(-1) like that.

Answer 13

My bad forgot to type that

Answer 14

okay, so you say that
```
Line1: y=3x+4
Line2: y=2x-1
```
right?

Answer 15

If so, then the first line is correct.
But the second on has an incorrect y-intercept.

Answer 16

second *one...

Answer 17

Ok let me try again

Answer 18

sure.

Answer 19

I got the same thing but both numbers negative

Answer 20

(your first line is correct, again, but) the second line has an incorrect y-intercept.

Answer 21

https://www.desmos.com/calculator/dfsakg2dek
here is the graph of the points that represent your second line.

Answer 22

Ok so what do I do from there

Answer 23

Can you tell me the equation of the second line?
(the slope is 2, count 2 units up, and 1 unit to the right)

Answer 24

(1,2)?

Answer 25

Sorry I got confused :/

Answer 26

@SolomonZelman ?

Answer 27

the slope of the second line is 2 correct?

Answer 28

you have a point, (-1,1) shift it 2 units up and 1 unit to the right.

Answer 29

what do you get for the y-intercept?

Answer 30

(-1.5,2)

Answer 31

again, use the https://www.desmos.com/calculator/dfsakg2dek .
See the point (-1,1) ?
then go 1 unit to the right and 2 units up.

Answer 32

Its on the 2 line

Answer 33

yes.

Answer 34

So line2 would be y=2x+?

Answer 35

If u dont want to help me its alright just tell me so I can find someone else to

Answer 36

+3.

Answer 37

Line1: y=3x+4
Line2: y=2x+3