One-Step Equations with Addition and Subtraction

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One-Step Equations with Addition and Subtraction TeacherTwins©2014

Warm Up

Equation- A mathematical sentence that contains an equal sign Equation- A mathematical sentence that contains an equal sign. To solve an equation you need to isolate the variable. Properties of Equality Addition- You can add the same value to each side of an equation and the sides will remain equal. Subtraction- You can subtract the same value from each side of an equation and the sides will remain equal.

You use the subtraction property of equality to subtract 2 from both sides in order to get the “y” by itself. 2 -2 x = -16 To check to see if your answer is correct, substitute the x in your equation with the -16. Solve the equation. If it is true then the value for x is correct.

You use the addition property of equality to add 6 to both sides in order to get the “y” by itself. +6 +6 x = 16 To check to see if your answer is correct, substitute the x in your equation with the 16. Solve the equation. If it is true then the value for x is correct

x = -3 x = 18 x = 0 a = 8 n = 19

Closure Write the equation for the problem and solve it. Jackie has 50 football cards now because his friend Jacob gave him 20 cards. How many football cards did his friend give him? X + 20 = 50 x= 30 He gave him 30 cards.