Q4 - Alg 1 - Hw #07

​ (a)   method adds two equations together to remove a variable.

​ (b)   method plugs an expression into another variable

• Elimination
• Substitution
• Solving
• Graphing

When adding this system of equations together, which variable is eliminated?

• x

• y

• number

• everything

In order to eliminate the y values, what number do you need to multiply the second equation by?

In order to eliminate the x-values, what number do you need to multiply the second equation by?

• 2

• -3

• -6

• 8

In order to eliminate the y values, what number do you need to multiply the second equation by?

Write the resulting equation when the y values are eliminated.

Mathematical Equivalence

OFF

Solve this system of equations

Which method is this system of equations set up to solve?

• Elimnation

• Substitution

• Graphing

In order to cancel out the y's:

Multiply the top row by: ​ (a)  

Multiply the bottom row by:​ (b)  

• 4
• 7
• 2
• 5

What is the solution to this system of equations?