Question

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 these is a possible step used in eliminating the y-term?

(y + z = 6) ⋅ 4
(3y + 4z = 1) ⋅ 4
(y + z = 6) ⋅ −3
(3y + 4z = 1) ⋅ 3

Answer 1

@sleepyjess

Answer 2

We want to be able to multiply the first equation by something that will cancel out y. So if we have 3y on one equation, do we want -3y or 3y to cancel it out?

Answer 3

-3y to cancle out 3y

Answer 4

Yes! So to get -3y, would you multiply by -3 or 3?

Answer 5

3?

Answer 6

y*3 = 3y, we want -3y

Answer 7

ohh ok ,ok i got it its C

Answer 8

yep :)

Answer 9

one more ill post it now