Question

Solve by substitution:

y = 2x - 3
y = -x + 1

Please help, I really don't get how to do this

Answer 1

@tHe_FiZiCx99

Answer 2

K, to substitute plug in y into the other equation,

y = 2x - 3
y = -x + 1


-x + 1 = 2x - 3

Now can you solve that?

Answer 3

I'm still not sure, i know how to substitute but this question has just been confusing me :/ @tHe_FiZiCx99

Answer 4

The term itself says it :P

Substitute in the " y = " equation into the other,

I subbed the second equation into the first,

Answer 5

solve for x after you substitute

Answer 6

I got dis >.<

Answer 7

how can i solve for x though?

Answer 8

-x + 1 = 2x - 3

Add both sides x

-x + 1 = 2x - 3
+x +x

1 = 3x - 3

Add both sides 3 to leave x alone,

1 = 3x -3
+3 +3

4 = 3x


Divide to isolate x

x = 4/3


NOW, to find Y plug in x into either equation and solve.

Answer 9

ok, whenever people say "solve for x" you just move the number around when problems are like this:

-x + 1 = 2x - 3
- 1= - 1
--------------
-x = 2x -4
-2x=-2x
------------
-3x= -4

and so on, get it?

Answer 10

it does not matter which number you start first from either side. get me?

Answer 11

I'm still a little confused but I'm catching on

Answer 12

Ok, so now plug in 4/3 to find y,

y = 2(4/3) - 3

First multiply 4/3 * 2

Answer 13

so y = -0.34

Answer 14

y = -1/3 :p


-1/3 = -0.33333333333333333333333333333333

Answer 15

4/3 * 2 = 2.6666666666666666666666666666667

2.6666666666666666666666666666667 - 3 = -0.33333333333333333333333333333333

Answer 16

You plug both y and x to see if its a true statement,

-1/3 = 2(4/3) - 3

-1/3 = -1/3 :P

Answer 17

-1.3 is y

Answer 18

and 2.6 is x

Answer 19

@tHe_FiZiCx99

Answer 20

never mind, -0.3 is y and -1.3 is x right?

Answer 21

No, you're not solving for them, your checking if they give you a true statement.

x = 4/3
y = -1/3

Answer 22

oh, ok thank you soooo much!!

Answer 23

yw