Warm-Up Exercises Solve the equation. 1. 2m – 6 + 4m = 12 ANSWER 3 2. 6a – 5(a – 1) = 11 ANSWER 6 Warm-Up Exercises Solve the equation. 3. A charter bus company charges $11.25 per ticket plus a handling charge of $.50 per ticket, and a $15 fee for booking the bus. If a group pays $297 to charter a bus, how many tickets did they buy? ANSWER 24 tickets Warm-Up1Exercises EXAMPLE Solve an equation with variables on both sides Solve 7 – 8x = 4x – 17. 7 – 8x = 4x – 17 7 – 8x + 8x = 4x – 17 + 8x 7 = 12x – 17 24 = 12x 2=x Write original equation. Add 8x to each side. Simplify each side. Add 17 to each side. Divide each side by 12. ANSWER The solution is 2. Check by substituting 2 for x in the original equation. Warm-Up1Exercises EXAMPLE Solve an equation with variables on both sides CHECK 7 – 8x = 4x – 17 ? 7 – 8(2) = 4(2) – 17 ? Write original equation. Substitute 2 for x. –9 = 4(2) – 17 Simplify left side. –9 = –9 Simplify right side. Solution checks. Warm-Up2Exercises EXAMPLE Solve an equation with grouping symbols 1 Solve 9x – 5 = 4 (16x + 60). 1 9x – 5 = (16x + 60) 4 Write original equation. 9x – 5 = 4x + 15 Distributive property 5x – 5 = 15 Subtract 4x from each side. 5x = 20 x=4 Add 5 to each side. Divide each side by 5. Warm-Up Exercises GUIDED PRACTICE for Examples 1 and 2 Solve the equation. Check your solution. 2. 20 + c = 4c – 7 ANSWER 9 Warm-Up Exercises GUIDED PRACTICE for Examples 1 and 2 Solve the equation. Check your solution. 3. 9 – 3k = 17k – 2k ANSWER –8 Warm-Up Exercises GUIDED PRACTICE for Examples 1 and 2 Solve the equation. Check your solution. 4. 5z – 2 = 5+3(3z – 4) ANSWER 5 12 Warm-Up Exercises GUIDED PRACTICE for Examples 1 and 2 Solve the equation. Check your solution. 5. 3 – 4a = 5(a – 3) ANSWER 2 Warm-Up Exercises GUIDED PRACTICE for Example 4 Solve the equation, if possible. 8. 9z + 12 = 9(z + 3) ANSWER no solution Warm-Up Exercises GUIDED PRACTICE for Example 4 Solve the equation, if possible. 9. 7w + 1 = 8w + 1 ANSWER 0 Warm-Up Exercises GUIDED PRACTICE for Example 4 Solve the equation, if possible. 10. 3(2a + 2) = 2(3a + 3) ANSWER identity Daily Homework Quiz Warm-Up Exercises Solve the equation, if possible. 1. 3(3x + 6) = 9(x + 2) ANSWER 2. 7(h – 4) = 2h + 17 ANSWER 3. The equation is an identity. 9 8 – 2w = 6w – 8 ANSWER 2 Daily Homework Quiz Warm-Up Exercises 4. 4g + 3 = 2(2g + 3) ANSWER 5. The equation has no solution. Bryson is looking for a repair service for general household maintenance. One service charges $75 to join the service and $30 per hour. Another service charge $45 per hour. After how many hours of service is the total cost for the two services the same? ANSWER 5h