Griffindore
  • Griffindore
hey i have 2 quick questions if anyone can help
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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Griffindore
  • Griffindore
A student is trying to solve the system of two equations given below: Equation P: y + z = 6 Equation Q: 3y + 4z = 1 Which of the following is a possible step used in eliminating the y-term?
anonymous
  • anonymous
is this type a typed answer?
Griffindore
  • Griffindore
(y + z = 6) ⋅ 4 (3y + 4z = 1) ⋅ 4 (y + z = 6) ⋅ −3 (3y + 4z = 1) ⋅ 3

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More answers

mathstudent55
  • mathstudent55
To eliminate a variable, you need to add the equations or multiples of the equations in which the same variable in both equations will add to zero.
anonymous
  • anonymous
In order to elminiate any term from an equation when you have multiple equations .. U've to multiply one with the first equation that will result in a "zero" when you add them up ... In Ur case, this would be the third choice :D Let me know if U got it :)
Griffindore
  • Griffindore
Ok
Griffindore
  • Griffindore
oh i get it that makes sence
mathstudent55
  • mathstudent55
You want to eliminate y. The second equation has 3y. If you could change the first equation to have -3y, that would do it. Does any choice change the first equation so that the y term becomes -3y?
anonymous
  • anonymous
sorry I meant to multiply by a constant factor :)
Griffindore
  • Griffindore
ya thats what i try but i kept getting stuck
Griffindore
  • Griffindore
can u guys help me out with one more
anonymous
  • anonymous
Feel free :D
Griffindore
  • Griffindore
ok
Griffindore
  • Griffindore
A set of equations is given below: Equation E: c = 2d + 1 Equation F: c = 3d + 7 Which statement describes a step that can be used to find the solution to the set of equations? Equation F can be written as c = 3(c − 1) + 7. Equation F can be written as c = 2(c − 7) + 1. Equation F can be written as d + 1 = 3d + 7. Equation F can be written as 2d + 1 = 3d + 7.
anonymous
  • anonymous
Just find d in term of c from Equation E and then plug the value in the other equation or find c in terms of d and do same steps :)
anonymous
  • anonymous
Let's try to get c in terms of d .. To do so, U've to get c in one hand and d on the other hand in one of the equations let's say equation E .. we already have that done for us .. then plug c in equation F and see if any of the answers is what we have got
mathstudent55
  • mathstudent55
Second problem. Look at the given equations. Notice they are both solved for c. Set them equal to each other. If c = 2d + 1 and c = 3d + 7, then 2d + 1 must equal 3d + 7 Which choice shows this?
anonymous
  • anonymous
If none of them is what we got .. Then we are now sure that the answer contains no d's ! So we try the other way .. Try to get d in terms of c from Equation E and plug it in equation F as well as what we have did in the last step for c in terms of d
mathstudent55
  • mathstudent55
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mathstudent55
  • mathstudent55
The answer is D
mathstudent55
  • mathstudent55
Replace the c of equation F with 2d + 1, since from equation E we know that c = 2d + 1. Answer is choice D.

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