Question

Which system of linear equations has no solution?
A. 2x − y = −1
2x + y = 2
B. 4x − y = 3
3x − 2y = 3
C. −2x + 4y = −16
4x − 2y = −1
D. 2x − y = −1
−2x + y = −1

Answer 1

Just go through each one and solve the systems until one doesnt work, so, for A,

2x - y = -1
+ 2x + y = 2

Answer 2

they y's cancel out because you have -1y + 1y which equals 0 so youre left with 4x = 1

Answer 3

solve that, and x = 1/4

Answer 4

plug that value of x into either one of the original equations and then solve for y, so.
2(1/4) - y = -1.
0.5 - y = -1
-y = -1.5
y=1.5

Answer 5

that one has a solution of (1/4, 3/2). do the same thing for the others until one doesnt work

Answer 6

*hint - if your values dont conveniently cancel out the way they do with A, you might have to multiply them until they do cancel out by numbers like -1, or 2 or so on*

Answer 7

So your saying that A is the answer

Answer 8

No, im saying that A is not an answer because it does have a solution

Answer 9

oh ok thank you

Answer 10

sure thing :)

Answer 11

Which system of linear equations shares the same line?
A. 6x − 3y = 15
8x − 4y = 20
B. 6x − 2y = 2
x + y =
C. 3x − 3y = 15
9x − 6y = 6
D. −4x + 4y = −4
2x + 2y = 2

Answer 12

what is the end of B?

Answer 13

1/3

Answer 14

Oh this is the last question

Answer 15

Try to convert each into y=mx+b form to make it easier.
A. -3y = -6x + 15 divide both sides by -3
y = 2x - 5

8x - 4y = 20. Subtract the 8x from both sides.
-4y = -8x + 20. Divide by -4 on both sides.

y = 2x - 5. the two are the same so they would make the same line, A is your answer

Answer 16

I got two wrong