SOLUTION: Can someone help me with this .also i need clarification when doing Elimination. how do i know when to add and subtract can i have 2 examples of showing when to add also and can s

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Question 593805: Can someone help me with this .also i need clarification when doing Elimination. how do i know when to add and subtract can i have 2 examples of showing when to add also and can someone help me with these 2 equations.I am trying to practice for exams.
4(2x-y=-2
2(4x+y=24

8x-12y=-2
- 8x+2y=48
- __________
- -10y +-50
- Y=-50/-10
- Y-5
4x+y=24
4x+5=24
4x=24-5
4x=19
.....this isn’t looking right so far
Also
Y=x+3
Y=x^2
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
Can someone help me with this .also i need clarification when doing Elimination. how do i know when to add and subtract can i have 2 examples of showing when to add also and can someone help me with these 2 equations.I am trying to practice for exams.
4(2x-y=-2
2(4x+y=24
8x-12y=-2 *** Is this a different problem? Where did you get -12y ?
===========
4(2x-y=-2
2(4x+y=24
---
2x-y=-2
4x+y=24
-------------- Add
6x = 22
x = 11/3
------
2x-y=-2
y = 2x + 2
y = 28/3
-----------
=============
- 8x+2y=48
- __________
- -10y +-50
- Y=-50/-10
- Y-5
4x+y=24
4x+5=24
4x=24-5
4x=19
.....this isn’t looking right so far
Also
Y=x+3
Y=x^2
-----
Both equal y, so
x + 3 = x^2

Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc)
Quadratic equation (in our case ) has the following solutons:



For these solutions to exist, the discriminant should not be a negative number.

First, we need to compute the discriminant : .

Discriminant d=13 is greater than zero. That means that there are two solutions: .




Quadratic expression can be factored:

Again, the answer is: 2.30277563773199, -1.30277563773199. Here's your graph:

-----------
y = x + 3
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