x + 4 – 4 = –3 – 4 Subtract 4 from each side. x = –7

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Presentation transcript:

x + 4 – 4 = –3 – 4 Subtract 4 from each side. x = –7 Solve Equations by Subtracting Solve x + 4 = – 3. x + 4 = –3 x + 4 – 4 = –3 – 4 Subtract 4 from each side. x = –7 Check?

A. Solve y + 7 = 3. Check your solution. 10 4 –4 –10

y – 3 = –14 Write the equation. Solve Equations by Adding Solve y – 3 = –14. y – 3 = –14 Write the equation. y – 3 + 3 = – 14 + 3 Add 3 to each side. y = –11 Answer: The solution is –11. Check your solution.

Simplify x – 2 = –9. 7 –7 –11 11

ENTERTAINMENT Movie A earned $225 million at the box office ENTERTAINMENT Movie A earned $225 million at the box office. That is $38 million less than Movie B earned. Which equation can be used to find the amount of money Movie B earned? A. B + 38 = 225 B. 38 – B = 225 C. B = 225 – 38 D. B – 38 = 225

CONSTRUCTION Board A measures 22 feet CONSTRUCTION Board A measures 22 feet. That is 9 feet more than the measure of board B. Which equation can be used to find the measure of board B? A. B + 9 = 22 B. B – 9 = 22 C. 9 – B = 22 D. B = 22 + 9 A B C D

MOUNTAINS Write and solve an equation to find the height of Guadalupe Peak, the highest point in Texas. Driskill Mountain, with a height of 535 feet, is the highest point in the neighboring state of Louisiana. It is 8214 feet lower than Guadalupe Peak. Let h = the height of Guadalupe Peak. 535 = h – 8214 Write the equation. 535 + 8214 = h – 8214 + 8214 Add 8214 to each side. 8749 = h Simplify. Answer: Guadalupe Peak is 8749 feet high.

BUILDINGS Write and solve an equation to find the expected height of the Freedom Tower, which is being built at the World Trade Center site in New York City. The Sears Tower in Chicago, 1450 feet tall, is 326 feet lower than the expected height of the Freedom Tower. 1450 = h + 326; 1124 feet h = 1450 – 326; 1124 feet 1450 = h – 326; 1776 feet 1450 – h = 326; 1776 feet Assignment