Name	Class	Date	

Practice 7-2

Solving Systems Using Substitution

Solve each system using substitution. Write no solution or infinitely many solutions where appropriate.
1.	y = x	2.    y = x + 4	 3.    y = 3x – 10
y = – x + 2	 y = 3x	  y = 2x – 5
4.	x = –2y + 1	5.    y = 5x + 5	 6.    y = x – 3
x = y – 5	 y = 15x – 1	  y = –3x + 25
7.	y = x – 7	8.    y = 3x – 6  	 9.    x = - 2y + 200
 y = -2x +8	 y = 3x + 6	  x = y + 50
10.	y = -3x + 10	11.    y = 2x + 7	12.   x =2/3y
y = –3x + 4	 y = 5x + 4                                       x = -y – 5
13.	y = - 2x + 8	14.    y = 3x + 6	15.   2x = -½ x – 3/2  
y = – 2x + 4	y = 2x + 5                                        x  = 3y + 7

Name	Class	Date	

Practice 7-2

Solving Systems Using Substitution

Solve each system using substitution. Write no solution or infinitely many solutions where appropriate.
1.	y = x	2.    y = x + 4	 3.    y = 3x – 10
y = – x + 2	 y = 3x	  y = 2x – 5
4.	x = –2y + 1	5.    y = 5x + 5	 6.    y = x – 3
x = y – 5	 y = 15x – 1	  y = –3x + 25
7.	y = x – 7	8.    y = 3x – 6  	 9.    x = - 2y + 200
 y = -2x +8	 y = 3x + 6	  x = y + 50
10.	y = -3x + 10	11.    y = 2x + 7	12.   x =2/3y
y = –3x + 4	 y = 5x + 4                                       x = -y – 5
13.	y = - 2x + 8	14.    y = 3x + 6	15.   2x = -½ x – 3/2  
y = – 2x + 4	y = 2x + 5                                        x  = 3y + 7