Introduction to Two-Step Equations

Given the system of equation x = 2y + 11 3x + 2y = 9 what would be the FIRST step?

• Plug them into desmos

• Substitute 2y + 11 for x in the second equation

• Substitute 3x + 2y for y in the first equation

• Eliminate the x values and solve

2d + 7 = 9 

• 1

• 7

• 4

• 3

11 = 3z + 5

• 2

• 6

• 1

• 4

2s - 4 = 6

• 5

• 3

• -5

• 2

Mathematical Equivalence

ON

Mathematical Equivalence

ON

-12 = 5r + 8

• -4

• 4

• 3

• 6

-6p - 3 = 9 

• -2

• 2

• 6

• 3

-14 = 4x - 2 

• -3

• 3

• 6

• 1

2c + 2 = 10

• 4

• 5

• 3

• -4