Which ordered pair makes the equation true?

4x – 9y = –5

(Points : 1)
(–5, –2)
(–1, 1)
(10, 5)
(20, 4)

Question

Which ordered pair makes the equation true?

4x – 9y = –5

(Points : 1)
       (–5, –2)
       (–1, 1)
       (10, 5)
       (20, 4)

anonymous · Answer

Okay, let's plug them in shall we?

4(-5)-9(-2) = -5. Now does it or does it not equal -5?

anonymous · Answer

So you basically multiply like so:

$$(4\times-5)-(9\times-2)= -5$$

anonymous · Answer

@Annie96 Are you there?

annie96 · Answer

yes i'm here.

anonymous · Answer

Are you able to tell me if that multiplication problem is true or false?

annie96 · Answer

true.

anonymous · Answer

Well, let's see.

$$4\times-5=-20$$

So -20 for the first part, now let's do the second part.

$$9\times-2=-18$$

So -18 for the second.

Now let's do -20 - -18 Two negatives, so we turn this into positive. -20 + 18 = -2

Thus, it's false. Not true. You see now?

annie96 · Answer

yes

anonymous · Answer

Are you able to input the (-1,1) like we just did, for x and y variables? The first number, replace the x with -1. Then the second, replace the y with 1. Then, do what we just did.

annie96 · Answer

Yes the true answer is (10,5)
 4(10)-9(5)=-5

anonymous · Answer

$$\Large correct, good job :)!!$$

annie96 · Answer

Thank You. for you're help.

anonymous · Answer

You're welcome. To correctly close a question, choose the best response, then close the question. Thanks :).