(A1) Extra Credit Mixed Solving Linear Systems

What is the solutions to this system?

• (-4, -2)

• (2, 5)

• (-4, 2)

• (-4, -4)

When solving the system below by "substitution" which equation and variable would be best to solve for?

2x + 4y = 8

7x+ y = -11

• 1st equation; solve for x

• 1st equation; solve for y

• 2nd equation; solve for x

• 2nd equation; solve for y

When solving this system by "elimination" what would be the best step to start with?

7x - 3y = -9

-7x +9y = 27

• add the 2 equations together to eliminate the "y"s

• add the 2 equations together to eliminate the "x"s

• multiply one of the equations by (-1) then add the equations to eliminate the "x"s

• multiply one of the equations by (-1) then add the equations to eliminate the "y"s

Determine if the point (-4, -3) is a solution to the given system:

y = -¹/₄x - 4

x - y = -7

• yes

• no

• more information is needed

Which is the correct graph for this linear system?

• 
• 
• 
• none of these

Which of the following graphs would represent no solution to a system of linear equations?

• 
• 
• 
• more information is needed

Which of the given linear systems does this graph represent?

• 
• 
• none of these

• 

What would be your answer if solving a linear system by elimination and you end up with the following?

13 = 13

• (0, 0)

• no solution

• infinite solutions

• (13, 13)

When solving the system below by "substitution" which equation and variable would be best to solve for?

x + 4y = 22

5x + 3y = 8

• 1st equation; solve for x

• 1st equation; solve for y

• 2nd equation; solve for x

• 2nd equation; solve for y

When solving this system by "elimination" what would be a good way to start? (more than one correct answer)

-3x + 27y = 21

5x - 9y = 1

• multiply the top equation by 9 and the bottom equation by 27, then add to eliminate the "y"s

• multiply the top equation by 9 and the bottom equation by 27, then add to eliminate the "x"s

• multiply the top equation by 5 and the bottom equation by 3, then add to eliminate the "x"s

• multiply the top equation by 5 and the bottom equation by 3, then add to eliminate the "y"s