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Orlov [11]
3 years ago
13

PLEASE HELP ASAP, FOUR MATH PROBLEMS, solving linear equations, using elimination and subtraction method

Mathematics
2 answers:
Rus_ich [418]3 years ago
6 0

Substitution means making one formula equal to a variable in the second formula to plug it in, and elimination means the cancelling out of one variable in order to make it easy to solve.

1. x-4(-x+5)=10            

  x+4x-20=10

  5x=30

  x=6, plug in 6 into original equation, y=-1

2. <u>-1(2x</u>-5y=6)

    <u>2x</u>+3y=-2    underlined means cancelled, so you add the rest up on each side

    5y+3y=-6+-2

    8y=-8

    y=-1, plug in this value to original equation, x=.5

3. 2(x+5)=2x+10

   2x+10=2x+10

   Infinite solutions

4. y=<u>4x</u>-3

-<u>4</u>(y=<u>x</u>+6)  underlined means cancelled

-3y=-27

 y=9, plug into original, x=3

   

Ratling [72]3 years ago
6 0

Answer:1. (-10,-5)

2.(1/2,-1) 3. All real numbers infinite solution 4.(3 9)

Step-by-step explanation:

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