Solve Equations Using Substitution

Solve the following systems of equations using substitution:

5x - 2y = 3

y = 2x

• (6, 3)

• (1, 2)

• (3, 6)

• (2, 1)

Solve the following systems of equations using substitution:

y = 3 - x

3y + x = 5

• No solution

• (1, 2)

• (3, 0)

• (2, 1)

Which answer has a correct first step for this system:

• The variable is already isolated, so we've already solved the system.

• The variable is already isolated for y, so we substitute it in the first equation and solve for x

  3x + 3(3x + 5) = 3

• Free sha vaca doo

• The variable is already isolated for y, so we substitute it in the second equation and solve for x

  y = 3(3x + 3y) = 3

Solve this system using substitution

y = 3x - 5

2x + 4y = -6

• (1, -2)

• (2, -2)

• (1, 2)

• Why have you done this?

Solve the system of equations using substitution:

y = 7x + 9

2y + 2x = -18

• (6.75, 2.25)

• (2.25, 6.75)

• (-2.25, -6.75)

• (-2.25, 6.75)

Solve the system of equations using substitution. -3x + y = -5 and -4x - y = -16

• (3, -14)

• (5, -20)

• (3, 4)

Solve the system of equations using substitution:
y = 2x + 5
2x + 2y = 4

• (1, 7)

• (7, 1)

• (2, 9)

• (-1, 3)

Solve the system of equations using substitution. y = -5x - 2 and y = -2x - 8

• (2, -12)

• (-2, 8)

• (2, 7)

Solve for x and y (Use Substitution)

y = 2x + 1

y = 4x - 1

• (1,3)

• (-1,-3)

• (-1,3)

• (3,1)

• (1,1)

Solve the system of equations using substitution. 3x + 4y = -2 and x = -2

• (-2, 1)

• (-2, -1)

• (1, -2)