Question

Solve using substitution..
y=2x+7
3x -y = -9

Answer 1

\[y=2x+7\] \[3x-y=-9\]
Can you plug the first equation into the second?

Answer 2

Oh yeah uhhh 3x - (2x + 7) = -9??

Answer 3

Yep!!!!!
so now distribute out the parenthesis, and then solve for x

Answer 4

2x + 7 = 9x?

Answer 5

3x - 9x = -6x..

Answer 6

Where are you getting this lol

\[3x-(2x+7)=-9\]
Imagine the negative sign as negative 1
And do the distributive property
So, the signs will change and become \[3x-2x-7=-9\]
now can you solve for x?

Answer 7

oh ok so x - 7 = -9
x = -9 + 7
x = -2?
o:

Answer 8

Yep
So now plug in the x into one of the equations to get y

Answer 9

I'll use the first one
y=2 (-2) + 7

Answer 10

y= -4 + 7
y= 3

Answer 11

Yep~

Answer 12

Wowie your smort thank you so much >.<

Answer 13

why, thank you xd

and yw~