Question

solve the system using substitution. Put the answer in pair form, (x,y)

{ x - 2y = -4
{ 2x - y = 1

Answer 1

@ajprincess

Answer 2

consider the first equation
x-2y=-4
can u pls tell me what u get when u solve it for x.

Answer 3

is it 2

Answer 4

nope.:(
solving for a variable gives that variable on one side and rest of the terms attached to it on the other side.
x-2y=-4
if u solve for x
then u should have x=somthing
As u can -2y is attached to x. to get x alone we need to remove it.
To do that add 2y.this will give
x-2y+2y=-4+2y
x=-4+2y
we add 2y to the other side since this is an equation both sides should be equal..getting this>

Answer 5

ohh okay

Answer 6

Nw u have x=-4+2y
plug in this value of x
in
2x - y = 1 . then u will get
2(-4+2y)-y=1
solve this for y