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dana.lindsey

  • 3 years ago

Solve, using linear combination. 3x + y = 4 2x + y = 4 (-1, 7) (0, 4) (-3, 12) (-3, 13)

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  1. JayDS
    • 3 years ago
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    Well there are two options to use substitution method or elimination method, I'm sure you are aware of this.

  2. dana.lindsey
    • 3 years ago
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    yes i am

  3. JayDS
    • 3 years ago
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    I'll be using the substitution one in this case. 1) 3x + y = 4 I am going to rearrange to y =ax + b form y = -3x + 4 sub y = -3x + 4 into second equation 2x + y = 4 2x + (-3x + 4) = 4 2x -3x + 4 = 4 -x = 0 x = 0 sub x = 0 back into either equations to find y 2x + y = 4 2(0) + y = 4 0 + y = 4 y = 4 so (0,4) and the second answer.

  4. dana.lindsey
    • 3 years ago
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    oooooo i get it now thank you :)

  5. JayDS
    • 3 years ago
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    no problem :) and remember you can always check with these type of questions if you have got it correct or not by subbing back the x and y values you obtained into the equations.

  6. dana.lindsey
    • 3 years ago
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    ok thank you :)

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