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Homework Review. n+1 n + 2 n – 2 7x – 2 = 19 x = 3 x + 24 = 16 x = -8 x+ x + 2 = -8 -5, -3 x + x + 2 + x + 4 = 36 10, 12, 14 x + x + 1 = -13 -7, -6 True true. Do Now. The sum of three consecutive integers is 114. What are the integers?
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Homework Review n+1 n + 2 n – 2 7x – 2 = 19 x = 3 x + 24 = 16 x = -8 x+ x + 2 = -8 -5, -3 x + x + 2 + x + 4 = 36 10, 12, 14 x + x + 1 = -13 -7, -6 True true
Do Now The sum of three consecutive integers is 114. What are the integers? The sum of two consecutive odd integers is 36. What are the integers?
What is perimeter? • When do we use it in real life?
Perimeter Problems • 1. Write an expression for the perimeter of the rectangle. 4x +7 3x + 5 4x + 7 + 4x + 7 + 3x + 5 + 3x + 5 combine like term 14x + 24
2. Square Write an expression for the perimeter 5x 3x + 7
3. Triangle Write an expression for the perimeter 3x 2x + 30 4x + 1
4. Write an expression for the perimeter: A rectangle has width of 2x + 3 and length of 3x + 4. 5. Write an expression for the perimeter: A triangle has sides of 2x, 3x + 6, 7x + 18 Draw before you solve
On your own Write an expression for the perimeter: 7. A rectangle has width of 2x – 1 and length of 6x + 7 8. A triangle has sides of x + 4, 5x, 8-2x
Perimeter is given • 9. Write an expression for the perimeter w 7.2 If the perimeter is 19.2 what is the width?
Perimeter – Write an equation • 10. The perimeter of the triangle is 24. Find x. x+4 ft 4x ft 10x-10 ft Write an equation 10x-10 + x + 4 + 4x = 24 Combine like terms 15x – 6 = 24 Add 6 to both sides 15 x = 30 x = 2
Find the value of x • 11. Perimeter is 30 meters (2x – 6) m (x+3) m Write an equation: x +3 + 2x – 6 + x + 3 + 2x – 6 = 30 Combine like terms 6x – 6 = 30 Add 6 to both sides 6x = 36 Divide by 6 x = 6
12. A triangle has sides of 2x + 10, 3x – 30, 4x – 15. If the perimeter is 82 find x. Draw the triangle first.