Question

Use the Substitution Method to solve the following system of equations.
2x - 9y = 1
x - 4y = 1

(1, 5)
(-5, -1)
(5, 1)
(-5, 1)

Answer 1

the substitution method involves substituting one variable for another

Answer 2

if u add 4y to the left and right of the eqn x - 4y =1, what will u get?

Answer 3

My bro sdfgsdfgs just wanted u to perfectly understand the question before applying this method. He's old school like me!

Answer 4

Sorry my brother, @sdfgsdfgs now takes over

Answer 5

@BPDlkeme234 no need to apologize - u actually posted be4 i did ;)

@kaylamarie081 would u like to work thro the prob or u waiting 4 someone to give u the ans?

Answer 6

i just need help through it all. i dont understand what to do.

Answer 7

@kaylamarie081 OK good :) lets work thro it together!

if u add 4y to the left and right of the eqn x - 4y =1, what will u get?

Answer 8

5y

Answer 9

Kaylamarie, thats a nice name!

Answer 10

Try again plz. it should be like this:

x - 4y + 4y = 1 + 4y

Answer 11

Just doing some rough work here. If you were to use the substitution method you might say:
x= 1+4y

Answer 12

So x = ?

Answer 13

you micht substitute the value of this in equation 1 to get:
2(1+4y) -9y =1

Answer 14

which might give you the following:
2+ 8y -9y = 1

Answer 15

From which you might find: 2-y =1
or to put it another way: -y = 1 -2
i.e y = -1+2

Answer 16

From there it is a snows drop away to find the answer, that y = 1.

Answer 17

Now all you need to do is substitute this value into either equation (it really doesnt't matter) in order to find the corresponding value for x

Answer 18

if any medals should go for this solution is should be to @sdfgsdfgs who showed me the solution

Answer 19

@BPDlkeme234 bro u are way too modest! i wuld give u another medal if i could!

Answer 20

there he is again, @sdfgsdfgs cant accepte he provided the solution!

Answer 21

He looked at the bakance of the equations and he knew there was something wrong

Answer 22

And he stepped right in there to correct it, while at the same time giving me his personal thoughts about this problem

Answer 23

All I did was reproduce the stuff he said

Answer 24

I picked up a medal for that, thanks @sdfgsdfg