Substitution Method
Solving systems of equations w/o graphing
x+y=6x=y+2
XY
Inside of the Y container, and inside of the X container are some little red donuts. How many little red donuts are in the Y container?
Solving systems of equations w/o graphing
x+y= 6x=y+2
XY
Solving systems of equations without graphing
x+y= 6x=y+ 2
XY
x+y= 6 x=y+2
XY
The first thing we want to do is line up the equal sign.
x+y=6 x=y+2
X Y
What does X =?
x+y=6 x=y+2
X
Y
What does X =?x=y+2
So…
y+2+y=6Qwizdom
x+y=6
X
Y
x=y+2
y+2+y=6Qwizdom
x+y=6 x=y+2
X
Y
x=y+2
So…
y + 2 + y = 6
+ + Y =
x+y=6 x=y+2
X
Y
x=y+2
y + 2 + y = 6
+ + Y =
Y Y+ = 4
x+y=6 x=y+2
Xx=y+2
y + 2 + y = 6
Y Y+ = 4How many Y’s do I have? 2y =4
x+y=6 x=y+2
X
Y
Y
+ = 4How many Y’s do I have? 2y = 4
Y =
Y
x+y=6 x=y+2
X
Y
2y = 4Y =
If 2y’s give me 4, then howMany would one y give me?