Question

Solve the system of equations using elimination

Answer 1

does the blue line mean you think it's B and want to check your answer?

Answer 2

No I didn't mean to put the blue line.

Answer 3

oh ok ^_^
so it says to solve it by 'elimination' are you familiar with what that means?

Answer 4

Eliminating any possible wrong answers? I think haha

Answer 5

haha, that is probably what it should mean!

Answer 6

it means that we want to 'add' the two equations together to get rid of either a x or y term

Answer 7

3x-5y=-2
4x-7y=-3
now if we just combined these two together we would get:
7x-12y=-5
do you see how I did that?

Answer 8

You got 7x by adding 3x and 4x .

- 12 y, you got 12 y but adding 5+7 then added -2+-3 = -5

Answer 9

by adding*

Answer 10

ok ok, good, so you get the idea of what 'elimination' is.
but when i combined the two equations, i didn't 'eliminate' a x term or a y term.

Answer 11

so to do 'elimination' we will need to multiply a number we pick to either the top or bottom equation that will change either the x or y term to be equal and oppostite to the value of term in the other equation...
clear as mud? haha

Answer 12

now for this one, there isn't any number that I can multiply the top or bottom equation by to get rid of an x or y term. so i'm going to have to mulitiply both equations by picked numbers. I'm going to try and get rid of the x term. so I want to make them both become 12 since 3*4 equals 12.