Question

Solving Linear equations with substitution. Can anyone teach me.

Answer 1

i can

Answer 2

please help, I understand what to do but I just don't know how to get the equation to solve it.

Answer 3

2x - 3y = -2
4x + y = 24
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you mean problems such as this one ?

Answer 4

yup @kelliegirl33

Answer 5

@kelliegirl33 I thought you didn't go on OS anymore...

Answer 6

nvm

Answer 7

my computer is acting up..I hope it doesn't disconnect.

The first thing you have to do is to isolate a variable. In this problem, the easiest variable to isolate is y. Do you understand ?

Answer 8

yup.

Answer 9

2x - 3y = -2
4x + y = 24

take your 2nd equation and isolate the y
4x + y = 24 -- subtract 4x from both sides
y = -4x + 24
now we substitute this back into the first equation
2x - 3(-4x + 24) = - 2

have I lost you yet ?

Answer 10

not yet

Answer 11

2x - 3(-4x + 24) = -2 --- distribute through the parenthesis
2x + 12x - 72 = -2 -- add 72
2x + 12x = -2 + 72 -- combine like terms
14x = 70 -- divide by 14
x = 5
now sub 5 in for x in the other equation
4x + y = 24
4(5) + y = 24
20 + y = 24
y = 24 - 20
y = 4
check...
4x + y = 24
4(5) + 4 = 24
20 + 4 = 24
24 = 24 (correct)

any questions ?

Answer 12

thats alot

Answer 13

ahhhhhhhhhhhhhhh OKAY THANK YOU SOOO MUCH!

Answer 14

yep

Answer 15

I just put in all the steps. It is really not that hard. Just be sure and keep track of your signs. It is a good idea to check your answers as well.

Answer 16

Thank you so much @kelliegirl33

Answer 17

no problem...any more problems with them and you can just tag me :)

Answer 18

@kelliegirl33 thankkk youuuuu