HW Lesson 45 on 5.5 Solving Systems - Alg I Pt I

The first step in solving using the substitution method is __________.

• get x by itself
• get y by itself
• get either variable by itself
• add the equations together

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What is the first step in solving a system of equations by elimination?

• Get both equations in standard form and line up the like terms.

• Get both equations in slope-intercept form.

• Get both equations equal to zero.

• Put the x terms first.

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3x + y = –14

–2x – y = 9

Which method would be best for solving this system?

• Substitution

• Elimination

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Which is the best algebraic method to use?

y = 6x − 11

−2x − 3y = −7

• Substitution because a variable is isolated.

• Elimination because both equations are in standard form.

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y = 6x - 11

-2x - 3y = -7

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y = -2

4x - 3y = 18

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-4x + y = 6

-5x - y = 21

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-7x - 2y = -13

x - 2y = 11

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-5x + y = -3

3x - 8y = 24

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-2x - y = -9

5x - 2y = 18

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