Question

Please, PLEASE HELP! I really need it! Algebra 2!

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to y from the first equation is substituted into the second equation.

12x - y = -4
4x - 3y = -6

Answer choices:

4x - 3(-12x - 4) = -6

4x - 3(12x + 4) = -6

4(12x + 4) - 3y = -6

4(-12x - 4) - 3y = -6

Answer 1

@tHe_FiZiCx99 Think you might be able to help? :l

Answer 2

Ohhh these, yes :P

Answer 3

Awesome!

Answer 4

The substitution method is when you convert one of the equations to isolate y or x to then plug in,

I'll find y,

12x - y = -4
-12x -12x

-y = -12x -4
/-1 /-1 /-1

y = 12x + 4

Sub in y = 12x + 4 for y into the other equation,


4x - 3(12x + 4) = -6

Apply distributive property,

4x -36x -12 = -6

-32x -12 = -6
+12 +12

-32x = 6
/-32 /-32

x = -0.1875 OR -3/16


Plug in x to solve for y,

4(-0.1875) - 3y = -6

-0.75 - 3y = -6
+.75 +.75

-3y = -5.25
/-3 /-3

y = 1.75 OR 7/4

Answer 5

AdrianK: Please start by solving 12x - y = -4 for y.

Answer 6

(-0.1875,1.75)

Answer 7

That's not an answer choice though

Answer 8

AdrianK: Please start by solving 12x - y = -4 for y.
Once you have this expression for y, substitute it into the 2nd equation; let this expression take the place of y in the second expression.

Answer 9

y=12x-4

Answer 10

Yes, it is. The question to solve for y and then plug in that for y into the other equation.

Answer 11

Whatever y equal's after you solved for y, plug that in, plug in " y=12x-4"

into 4x - 3y = -6 for y

4x - 3( ?? ) = -6

Get it?

Answer 12

It's in my illustration above lol

Answer 13

I kinda get it. It just dont see your solutions though

Answer 14

like 1.75 or 7/4 isn't an answer

Answer 15

What do you mean solution? I completely solved it. Though they didn't ask me to, they only asked " which of these equation looks like after plugging in for y." Meaning after you substitute your y into the other equation, pick which is the one that looks exactly like it.



Suppose they asked for: 3x + 2y = 2 and 5x + 8y = 2

I would solve for y,

Take the first equation and solve for y,

y = -3/2x + 1

Plug that into Y for 5x + 8y = 2

It looks like this: 5x + 8(-3/2x + 1) = 2

Answer 16

so it would be 2 and -3?

Answer 17

Look at your options, after you solved the first equation for y, plug that in for 4x - 3y= -6

Answer 18

OH MY GOD! I'm sorry!!

Answer 19

I was looking at the wrong question! I was looking at the oone above this one -_-

Answer 20

so it would be B?

Answer 21

Just substitute the y you solve for, into 4x-3(SUB the Y you solved for) = -6

Answer 22

Yes, B :P

Answer 23

again, im sorry lol

Answer 24

np, its fine :P

Answer 25

Think you could help me with one more? (:

Answer 26

ya

Answer 27

What are the x-coordinates of the solutions to this system of equations?

x2 + y2 = 16
y = x + 4

Answer Choices:

-4 and 0

4 and 0

-2 and -3

2 and -3

Answer 28

-4 and 0

Answer 29

to solve for x set y for 0

to solve for y set x for 0

Answer 30

Thanks!!!

Answer 31

np