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Simultaneous Equations Practical Construction
- 4. Simultaneous Equations recap How do you go about solving simultaneous equations?...
- 5. A few hints . . . (1)Scale up each term in one, or both equations to make the same number in front of either the x terms or the y terms. (2)Subtract if the signs in front if the signs are the same. (3) Add if the signs in front of the numbers are different. Lets work through the first one together – have your NO MESS handout ready…..
- 6. 5x + y = 20 2x + y = 11 … (1) … (2) Number the Equations 3x = 9 Subtract (to get rid of a letter) Divide (to find x) x = 3 Substitute in (2) (to find y) 2 x 3 + y = 11 6 + y = 11 y = 5 1 You try the next one…
- 7. 7x + y = 43 3x + y = 23 … (1) … (2) Number the Equations 4x = 20 Subtract (to get rid of a letter) Divide (to find x) x = 5 Substitute in (2) (to find y) 3 x 5 + y = 23 15 + y = 23 y = 8 2 A nice System….