Question

Use substitution
1. y=x+6
y=2x

a.(6,12)
b.(-12,-6)
c.(-6,-12)
d.(2,4)

Answer 1

y = x + 6
y = 2x

since both of them are y, then they must be equal to each other, right?

Answer 2

im not really sure

Answer 3

x + 6 is equal to y
2x is equal to y

so they must be equal to each other, since they both equal y.
x + 6 = 2x
So just solve for x ^_^

Answer 4

A?

Answer 5

That is correct :)

Answer 6

what about this one
2. 3x+2y=7
-3+11=y

a.(6,-3
b.(6,-7)
c(-4,9/12)
d.(5,-4)

Answer 7

For one thing, I'm sure you missed something in that second equation.
And... is this a quiz?

Answer 8

no thats the equation and no its not

Answer 9

-3x

Answer 10

I see. Well what you do here is replace the y in the first equation with -3x + 11
and then solve for x.

Answer 11

how do i solve for x?

Answer 12

First, replace the y in the first equation with -3x + 11.
Show me what you get.

Answer 13

im confused

Answer 14

Okay, how about I present an example?

Answer 15

it might help

Answer 16

Will it though?
^_^

Suppose we have
2x + 8y = 22
y = x - 1

so, you see that y in the first equation?
We replace it with x - 1, which comes from the second equation.
Like so:
2x + 8(x - 1) = 22

Now do likewise

Answer 17

so like -3x+11(x-1)=7?