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Solve one step equations

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You can add the same amount to both sides of an equation and the statement will remain true. 2 + 3 = 5 + 4 2 + 7 = 9 x = y + z = + z x + z = y+ z Addition Property of Equality Subtraction Property of Equality 4 + 7 = 11 –3 – 3 4 + 4 = 8 You can subtract the same amount to both sides of an equation and the statement will remain true. x = y – z = – z x – z = y – z

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Use inverse operations when isolating a variable. Addition and subtraction are inverse operations, which means that they “undo” each other.

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EX 1) b – 7 = 2.4. Check your answer. b – 7 = 2.4 + 7 +7 b = 9.4 Check b – 7 = 24 9.4 – 7 = 2.4 ? 2.4 = 2.4 ? EX2) -0.3 + y = 21 Check your answer. -0.3 + y = 21 + 0.3 y = 21.3 Check – 0.3 + y = 21 -0.3 + 21.3 = 21 ? 21 = 21 ?

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You can multiply the same amount to both sides of an equation and the statement will remain true. 2 + 3 = 5 4 ( ) (4) 20 = 20 x = y z x (z) = y(z) Multiplication Property of Equality Division Property of Equality 5 + 7 = 12 3 3 4 = 4 You can divide the same amount to both sides of an equation and the statement will remain true. x = y z = z x ÷ z = y ÷ z

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Like addition and subtraction, multiplication and division are inverse operations. They “undo” each other. ÷

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EX3) 51 = 17x. Check your answer. 17 -3 = x Check -51 = 17x -51 = 17(-3) ? -51 = -51 ? 7.6 = 19y 19 0.4 = y Check 7.6 = 19y 7.6 = 19(0.4) ? 7.6 = 7.6 ? 7.6 = 19y. Check your answer. -51 = 17x EX4)

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EX5) = 13 Check your answer. h2h2 h2h2 = 13 (2) h = 26 Check h2h2 = 13 13 = 13 26 2 ? = 13 = 30 Check your answer. X 1.5 = 30 (1.5) x = 45 Check x 1.5 = 30 30 = 30 ? 150 is a solution. 45 1.5 ? = 30 X 1.5 (2) EX6) (1.5)

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ASSIGNMENT PAGE 515 1-6 IXL V3

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Solve one step equations Date _________________

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You can ______ the ______ amount to _______ sides of an equation and the statement will remain _____. 2 + 3 = 5 x = y Addition Property of Equality Subtraction Property of Equality 4 + 7 = 11 You can __________the ______ amount to _______sides of an equation and the statement will remain _________. x = y

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Use inverse operations when isolating a variable. Addition and subtraction are inverse operations, which means that they “undo” each other.

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EX 1) Check your answer. Check EX2) Check your answer. Check

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You can __________ the ______ amount to ______ sides of an equation and the statement will remain ______. 2 + 3 = 5 x = y Multiplication Property of Equality Division Property of Equality 5 + 7 = 12 You can ________ the ______ amount to ______ sides of an equation and the statement will remain ______. x = y

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Like addition and subtraction, multiplication and division are inverse operations. They “undo” each other.

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EX3) Check your answer. Check Check your answer. EX4)

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EX5) Check your answer. Check Check your answer. 150 is a solution. EX6) Check

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Lesson Quiz: Part II 6. The cost of each ticket at the carnival was $0.25. Li bought $7.50 worth of tickets. How many tickets did she buy? 30

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The Giants scored 13 points in a game against Dallas. They scored 7 points for a touchdown and the rest of their points for field goals. How many points did they score on field goals? Let f represent the field goal points. 7 points + field goal points = points scored 7 + f = 13 – 7 f = 6 They scored 6 points on field goals. Subtract 7 from both sides.

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A basketball player scored 23 points during a game. Of those points, 3 were from 3-point goals and the remainder were 2 point goals. How many points did he score with 2 point goals? Let x equal the points scored by 2 point goals. 3 point goals + 2 point goals = points scored 9 + x = 23 – 9 x = 14 He scored 14 points from 2 point goals. Subtract 9 from both sides.

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