Khan Academy Algebra

2x + 3(5x - 7) = 47

• 1
• 2
• 3
• 4

Tags

CCSS.8.EE.C.7B

8v - 4(v + 8) = 8

• 2
• 10
• 4
• -4 

Tags

CCSS.8.EE.C.7B

Find the Error
What error did the student make when solving the equation:
1/5x + 6 = 3/5x + 5
1x + 6 = 3x + 5
-2x + 6 = 5
-2x = -1
x = 1/2

• The student found an incorrect common denominator
• The student did not multiply all terms by the common denominator
• The student did not use opposite operations appropriately
• The student did not correctly eliminate the variable from one side of the equation

²/₃(5x + 6) = 34

• 51
• 45
• 8
• 9

Tags

CCSS.7.EE.B.4A

Solve for y:
8x + 4y= 16

• y = -8x + 16
• y = 2x -4
• y = -2x + 4
• y = -8x + 12

Tags

CCSS.6.EE.C.9

4x + 3y = 9 Slope-intercept form: 

• y = − 3/4 x + 3
• y = − 4 /3 x + 9
• y = − 4 /3 x + 3
• y = − 4 /3 x + 6

Tags

CCSS.8.EE.B.6

CCSS.8.F.A.3

Solve for a.

• a = pw
• a = p/w
• a = w/p
• a = w + p

Tags

CCSS.HSA.CED.A.4

Steffen graphed two lines in order to find the solution to a given system of equations.
What is the solution?

• (-3,-8)
• (-8,-3)
• (3,-8)
• (8,3)

Tags

CCSS.8.EE.C.8B

Solve -2 = 4r + s for s.

• s = -2 + 4r
• s = 2 - 4r
• s = -2 - 4r
• s = 2 + 4r

Tags

CCSS.6.EE.C.9

Solve for x and y
5x + 3y = 7
y = 4

• (4,1)
• (4,-1)
• (1,4)
• (-1,4)

Tags

CCSS.HSA.REI.C.9