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## Answers

Substitution Method When you are given a systems of equations where one variable is given an expression, you can use this substitution method.

by elimination meathod

3x+2y=5

x+y=9 (mulltiply 3 to both sides)

3x+2y=5

3x+3y=27

subtract

-y= -22

y=22

x+22=9

x=9-22

x= -13

by substitution method

x+y=9

x=9-y

put value in second equation

3(9-y)+2y=5

27-3y+2y=5

27-y=5

-y=-27+5

-y= -22

y=22

x=9-y

x=9-22

x= -13