Question

Which ordered pairs make the equation true
3x + 2y = –7
(–3, 1)
(–2, –1)
(1, –4)
(3, –8)

Answer 1

To solve this, you would have to take the answers, let's use (-3, 1) and plug them into the equation:
\[x = -3, y = 1\]
\[3(-3) + 2(1) = -7\]
Now, which of them do you think is the answer?

Answer 2

i have never done this hahah i have no clue! what are you doing with x+-3,y=1 sorry im not the brightest

Answer 3

how do i solve the bottem one? 3(-3) + 2(1) = -7

Answer 4

@Nibby

Answer 5

can you explain how to solve this? you dont have to gve me the answer just explain it?

Answer 6

To solve the bottom one, times 3 by -3, which gives you -9.
Then, times the 2 by 1, which gives you 2.
Now you add them together, -9 + 2 = ?

Answer 7

-7! omg your a life saver!!

Answer 8

Sure. The answers are given in X and Y, So let's look at the first answer.
The first answer is (-3, 1). The number on the left is the X and the number on the right is Y.
So, X = -3, and Y = 1. Since we know this, and the equation is asking:
3x + 2y = -7, then we can plug in the X and the Y into the equation. Since we know X is -3, and Y is 1, we can then change the equation to:
3(-3) + 2(1) = -7

Make sense?

Answer 9

yep
do i always multiply

Answer 10

If the equation is 3 + x, then you would put X in. So, if our X is still -3 (It won't always be the same!) the equation becomes: 3 + (-3)

Answer 11

So, no, you will not always multiply.

Answer 12

so x equales multiply ?

Answer 13

No, no. X is the substitute of a number we don't know. So, in the equation:
\[3x + 1 = 0\]
We don't know what X is yet. We have to find it.
X does not mean multiply, it's just a number we don't know yet.

Answer 14

ahhh ok

Answer 15

can u help me set up the next one. just the basic first 2 steps

Answer 16

Sure!

Answer 17

just for practice the second option on this questopn(–2, –1)

Answer 18

ugh (-2,-1)

Answer 19

Since our equation is:
\[3x + 2= -7\]
We have to take the X and Y from (-2, -1) and plug them in. Since the first number in the pair is X, we now know that X is -2, and Y is -1, since Y is the second number in the pair. Since we know this, we can plug them straight into the equation, so our equation becomes:
\[3(-2) + 2(-1) = -7\]
In order to solve this, we times 3 by -2, because 3(-2) is basically 3 * (-2). This becomes -6. Next, we have to times 2 by -1, because 2(-1) is 2 * (-1). This becomes -2. Then we plug them in, so our equation becomes:
\[-6 + - 2 = -7\]
We know this can't be the answer because -6 + -2 = -8, not -7.

Answer 20

@Nibby

Answer 21

x + 3y < 9 is it supposed to equal 9 or less than 9

Answer 22

The above statement means that 9 is greater than x + 3y.
Because < Means the number on the right is greater, > means the number on the right less, and = means they are equal.

Example:
1 < 2
2 > 1
2 = 2

Answer 23

yes. i know that but what is this equation asking for?
would my naswer equal 9 or ?

Answer 24

@Nibby

Answer 25

The x + 3y is less than 9.