Question

I need help with the steps! solve by elimination;
x+10y=-10
8x+5y=-5
please/thanks:)

Answer 1

Rearrange one of them to solve for either x or y, and then sub it into the other equation.

Answer 2

2times (8x+5y=-5) - (x+10y=-10) <--- get x

Answer 3

How about you multiply the bottom equation by -2 so that when you add them, your y variables cancel?

Answer 4

So, for example. The top one, rearranged to solve for x is x=-10y-10. Sub that into the bottom equation to get 8(-10y-10)+5y=-5

Answer 5

Thanks guys, that helped!

Answer 6

No Problem, citizen! UP UP AND A BATMAN AWAT

Answer 7

away

Answer 8

@NotTim i think that is substitution, not elimination

Answer 9

OH BOTHER. YOU'RE RIGHT.

Answer 10

BUGGER. How do I do it by elimination, I shan't remember.

Answer 11

ahhh crap im confused now

Answer 12

For elimination, multiply a constant on both sides of a equation so that you can cancel it by adding to / subtracting from the other one. Take the question as an example.
x+10y=-10 -(1)
8x+5y=-5 -(2)
the easier way is to multiply (2) by 2 and subtract it from (1)
that is (1) - (2)x2
(x+10y) - (8x+5y)x2 = (-10) -(-5)x2
you will see that you can cancel the unknown y after expanding it

Answer 13

(x+10y) - (16x + 10y) = (-10) + 10
x + 10y -16x -10y = 0
and solve it..

Answer 14

THANK YOU @Callisto

Answer 15

Do you really understand?

Answer 16

At least this problem yes!

Answer 17

Then try another way by cancelling x for this question

Answer 18

blehhhhhhh:(

Answer 19

i need to make sure you really understand the skill...

Answer 20

:( FINE! but im not gonna like it-___-

Answer 21

i dont get it:O