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solve by substitution

solve by substitution. 2x – y = -9 3x – 8y = -7. (-5 , -1). Simplify. a) (4x 3 y 5 ) 3. Solve for x :.

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solve by substitution

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  1. solve by substitution 2x – y = -9 3x – 8y = -7 (-5, -1)

  2. Simplify • a) (4x3y5)3

  3. Solve for x:

  4. A caterer is planning a party for 232 people. The customer has £808 to spend. A £32 pan of pasta feeds 8 people and a £36 sandwich tray feeds 12 people. How many pans of pasta and how many sandwich trays should the caterer make? p = no. of pans of pasta w = no. of trays of sandwiches p = 14 w = 10 32p + 36w = 808 8p + 12w = 232 14 pans of pasta 10 sandwich trays

  5. Solve for x: 5(x + 2) – 2(3 – 2x) = 3

  6. Solve for x: x(2x + 1) – 2(x + 1) = 2x(x – 1) x = 2

  7. Solve for x:

  8. The bill for 3 Big Macs and 2 Cokes is 20 CHF. The bill for 7 Big Macs and 8 Cokes is 55 CHF. What would be the bill for 2 Big Macs and 1 Coke? b = cost of 1 Big Mac c = cost of 1 Coke 3b + 2c = 20 7b + 8c = 55 b = 5 CHF c = 2.5 CHF 2 Big Macs and 1 Coke would cost 12.50 CHF.

  9. Simplify a) 7-1 + 70

  10. Solve for x:

  11. solve by substitution 5x – y = -11 4x + 12y = 4 (-2, 1)

  12. Travis collects only 50-cent and $1 coins. His collection consists of 43 coins and their total value is $35. How many of each coin type does he have? He has 16 50¢ coins and 27 $1 coins

  13. solve by elimination 2x + 7y = 2 3x + 5y = -8 (-6, 2)

  14. If p = 4, q = -2 and r = 3 find the value of 5r – 4q 23

  15. George is 10 years older than Jane. Three years ago Jane was ¾ as old as George. How old is George now? George is 43 years old.

  16. Simplify

  17. Write without brackets or negative exponents a) (2a)-1 b) ab-1

  18. Write as powers of 2, 3, or 5 =3-3x =5-2 =2-2

  19. Solve for x. 4x = 8

  20. solve by elimination 3x + 2y = 22 9x – 8y = -4 (4, 5)

  21. Solve for x.

  22. Your family is planning a 10 day trip to California. You estimate that it will cost $480 per day in Los Angeles and $380 per day in San Diego. Your total budget for the 10 days is $4200. How many days should you spend in each location? a = no. of days in Los Angeles d = no. of days in San Diego a = 4 d = 6 a + d = 10 480a + 380d = 4200 4 days in Los Angeles 6 days in San Diego

  23. Solve for x.

  24. If p = 4, q = -3 and r = 2 evaluate 5

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