Question

Can someone help me with alge 2 substitution and elimination? :
big bracket { x + 2y = -7
{ 2x - 3y = 0

Answer 1

yes i can

Answer 2

Good, thank you! :)

Answer 3

x + 2y = -7 (equation 1)
2x - 3y = 0 (equation 2)

first for equation 1

x + 2y = -7
x = -7 - 2y (equation 3)

substitute this equation 3 to equation 2, then

2x - 3y = 0
2(-7 - 2y ) - 3y =0
-14 - 4y -3y = 0
-14 -7y = 0
-7y = 14
y = 14/(-7)
y = -2

Answer 4

from equation 1

x + 2y = -7
x + 2 (-2) = -7
x -4 = -7
x = -7 +4
x = -3

Answer 5

Wait, why did you separate the x and not the y, i should be getting the y alone correct?

Answer 6

If I were to separate the y, the answer is y = 1/2x-3.5 for equation 1 correct?

Answer 7

I got a different answer when i did substitution on the way I did it

Answer 8

(x,y) = (0,-3.5)
I am not entirely sure if its correct