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Solve systems by substitution
Contributed by: Foster
(Original author: Childress)
y = -2
4x - 3y = 18
Substitute the appropriate expression into theother equation of this system.
4x-3(       ) = 18
(
y = -2
4x - 3y = 18
solve the system of equations 
by substitution method
,
)
2x - 3y =  -1
x = y + 1
2(              ) -3y= -1
Substitute the appropriate expression into theother equation of this system.
(
2x - 3y =  -1
x = y + 1
solve the system of equations 
by substitution method
,
)
y = 6x - 11
-2x - 3y = -7
-2x-3(           )=-7
Substitute the appropriate expression into theother equation of this system.
(
y = 6x - 11
-2x - 3y = -7
solve the system of equations 
by substitution method
,
)
y = -2x + 20
6x - 5y = 12
6x-5(           ) = 12
Substitute the appropriate expression into theother equation of this system.
(
y = -2x + 20
6x - 5y = 12
solve the system of equations 
by substitution method
,
)
-3(            ) - 3y = -15
x = -3y + 1
-3x - 3y =  -15
Substitute the appropriate expression into theother equation of this system.
(
x = -3y + 1
-3x - 3y =  -15
solve the system of equations 
by substitution method
,
)
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