Substitution method

When solving with substitution, what is the first step?

y = 3 - x

2x - 3y = 21

• 2x - 3(3-x) = 21

• 2(3 - x) - 3y = 21

• (2x - 3y) = 21

• (3-x) = 21

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the system of equations using substitution

y = 4

x - 4y = 5

• x = 18, y = 4
• x = 12, y = 4
• x = 21, y = 4
• x = 25, y = 4

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

If two lines intersect at one point, then the system of equations has​ (a)  

• one solution
• infinite solutions
• no solution

Tags

CCSS.8.EE.C.8A

Find the value of x that would result in the same value of y in both equations

(the x in the solution to the system of equations)

y = 3x

y = x + 12

• 4
• 8
• 10
• 6

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Find the value of y in the system of equations

x = -2

y = 3x + 2

• -4
• 0
• -2
• 5

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Tags

CCSS.7.EE.A.1

What is the solution to the system?

• (3, -1)
• (2, -6)
• No Solution 
• (6, -2)

Tags

CCSS.8.EE.C.8B

These two lines intersect at _____.

• (4, -2)
• (4, 2)
• (-2, 4) 
• No solution

Tags

CCSS.8.EE.C.8B

What is the first step in solving with substitution?

5x + 2y = 5

y = 3x + 8

• 5(3x+8) = 5

• 5x + 2(3x+8) = 5

• (3x+8) = 5

• 5x + 2y = (3x + 8)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

How many solutions does this system of equations have?

• one solution

• infinite solutions

• no solution

• two solutions

Tags

CCSS.8.EE.C.8A