Intro to Elimination

Which variable would be easiest to eliminate?

4x + 8y = 20

−4x + 2y = −30

• x because they have equal coefficients but opposite sign

• y because they have equal coefficients but opposite sign

Which variable would be easiest to eliminate?

• x because they have equal coefficients but opposite sign

• y because they have equal coefficients but opposite sign

Which variable would be easiest to eliminate?

• you cannot solve this using eliminiation

• x because they have equal coefficients but opposite sign

• y because they have equal coefficients but opposite sign

Solve using Elimination Method:

x - y = 11

2x + y = 19

• (10,-1)

• (-1,10)

• (3,-4)

• (6,7)

Solve using Elimination Method:

x - y = 11

2x + y = 19

• (10,-1)

• (-1,10)

• (3,-4)

• (6,7)

Solve the following system of equations using the elimination method:

• (-2, 1)

• no solutions

• (-2, 0)

• (-1, -3)

Solve using Elimination Method:

4x + 9y = 28

-4x - y = -28

• (-7,0)

• (6,0)

• (-6,0)

• (7,0)

• (6,7)

Solve the system:

x + 6y = 17

-x + 3y = -8

• (5, 2)

• (11, 1)

• (1, 11)

• no solution

What would be the first step in finding the solution with elimination?

4x + 3y = 1

x - 3y = -11

• cross out the 3y and -3y

• cross out the 4x and x

• change all the signs of the second equation

• add 1 and -11

what is the combined resulting equation?

• x + 11y = -31

• 11y = -31

• 11x = -31

• 4x + 11y = -31

• i need tutorials