Warm-Up - Unit 5 Day 2 - Solve Systems by Substitution

The solution to a system of equations is any ordered pair that makes both equations true. 

• TRUE
• FALSE

Tags

CCSS.HSA.REI.C.9

The first step in solving using the substitution method is __________.

• get x by itself

• get y by itself

• get either variable by itself

• add the equations together

What is the
slope-intercept form
of the equation
-8x+2y=4

• none
• y=2-4x
• y=4x+2
• y=4x-8y

Tags

CCSS.8.EE.B.6

CCSS.8.F.A.3

Given the equation
4x + 2y = 10 (standard form), what is the slope-intercept form of this equations?

• y = 2x + 5
• y = -2x + 5
• y = 4x + 10
• y = -2x - 10

Tags

CCSS.8.EE.B.6

CCSS.8.F.A.3

Which answer has a correct first step for this system:

3x + 3y = 3

y = 3x + 5

• 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

• Isolate the x in the first equation.

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

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

Which answer is a good first step of this system

x + y = 3

3x + y = 5

• Solve for a variable

  x + y = 3

  -x____ -x

  y = -x + 3

• Substitute

  x + 3x = 3

• Solve for a variable

  x + y = 3

  y = x + 3

When solving a system of equations algebraically, which statement results in infinite solutions?

• 4 = 7

• 2 = 2

• -3 = 3

• all of the above

Tags

CCSS.8.EE.C.8B

When solving a system of equations algebraically, which statement results in no solution?

• 4 = 7

• -2 = 2

• -3 = 3

• all of the above

Tags

CCSS.8.EE.C.8B