Question

NEED HELP 8TH GRADE MATH!
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?

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

Answer 1

@dogz_101 do you know this?

Answer 2

I might im in 8th grade also so let me double look at it :)

Answer 3

do you know what the elimination method is, have you ever done elimination previously?

Answer 4

yes @SolomonZelman

Answer 5

And thanks @dogz_101

Answer 6

if so, then tell me - by what should you multiply Equation P, so that when you add Equation P and Equation Q you get one variable (lets say "y") eliminated?

Answer 7

Im stuck on that thats why its hard i havent done any math in almost a week

Answer 8

but i think its B, am I right? @SolomonZelman

Answer 9

@dogz_101 did u find out?

Answer 10

@kelliegirl33 do you know this?

Answer 11

yes I do.
you would multiply the first equation by a -3
this will give you :
-3y - 3z = -18
3y + 4z = 1
---------------
0 + z = -17
z = -17

as you can see, when added, the y terms cancel out...they are eliminated
answer is C

Answer 12

Thank you i have like 10 more of these this will help me alot THANK YOU!!

Answer 13

sure thing :) tag me if you need help

Answer 14

k thanks