anonymous
  • anonymous
is -x-4x=3x??
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
only if x=0
mathstudent55
  • mathstudent55
-x is the same as -1x -4x is -4 x If you had -1 -4 what do you get?
mathstudent55
  • mathstudent55
-1 - 4 = ?

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More answers

anonymous
  • anonymous
-5?
anonymous
  • anonymous
im having a lot of trouble with this Solve the system. y = 2 - x and y = 4x + 7 (1, 1) (1, 3) (-1, 3) (-1, 1) no solution im prettyy sure tis no solution
mathstudent55
  • mathstudent55
Right, so since -1 - 4 = -5, then -x - 4x = -5x
mathstudent55
  • mathstudent55
Now the system. Again, you have the two equations solved for y already, so use substitution.
mathstudent55
  • mathstudent55
Do you remember from the two previous systems what to do next?
anonymous
  • anonymous
yes im working ion it
mathstudent55
  • mathstudent55
Ok, let me see what you're up to since you're having trouble with it.
anonymous
  • anonymous
ok so i had 2-x=4x+7 2-x +2=4x+7+2 -x=4x+9 -x-4x=9 now im stuck
mathstudent55
  • mathstudent55
The 2 on the left side is positive, so you need to subtract 2 from both sides.
anonymous
  • anonymous
-x (so -1x) take away 4 more x's. It's like being $1 in the hole in the bank account. Spend four more bucks, and you are $5 in the whole, not $3. However... -x - 4x = 3x is interesting because: -x - 4x + x = 3x + x Then we have -4x = 3x Then as said above, if x = 0, then it is true, otherwise no. Hope this helps.
mathstudent55
  • mathstudent55
2 - x = 4x + 7 2 - 2 - x = 4x + 7 - 2 -x = 4x + 5 Now subtract 4x from both sides
anonymous
  • anonymous
-4-4x=5
mathstudent55
  • mathstudent55
-x - 4x = 4x - 4x + 5 -5x = 5
anonymous
  • anonymous
x=-1?
mathstudent55
  • mathstudent55
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mathstudent55
  • mathstudent55
right, x = -1
mathstudent55
  • mathstudent55
Now insert this value of x in one of the original equations, and solve for y
anonymous
  • anonymous
sorry i had to do something i do it one sec
anonymous
  • anonymous
1,3 ?
mathstudent55
  • mathstudent55
y = 3. You're right, but remember x = -1, not x = 1
anonymous
  • anonymous
thanks you!
mathstudent55
  • mathstudent55
|dw:1356283635553:dw|
mathstudent55
  • mathstudent55
You're welcome.
anonymous
  • anonymous
one more question The ordered pair (-1, -1) is a solution of the system -4x + 2y = 2 and x + y = -2. True False
anonymous
  • anonymous
i think its true
mathstudent55
  • mathstudent55
Substitute the ordered pair into both equations. If it makes them both true, it's a solution.
anonymous
  • anonymous
ok i did it its true
mathstudent55
  • mathstudent55
-4x + 2y = 2 Try (-1, -1) Is -4(-1) + 2(-1) = 2 ? 4 - 2 = 2? Yes. The ordered pair works in the first equation. Now try the second. x + y = -2 Is -1 + (-1 ) = -1 true? -2 = -2. It's true. You are correct, (-1, -1) is a solution.
mathstudent55
  • mathstudent55
Good job!
anonymous
  • anonymous
=D

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