Please answer all quistion and show your work.Please answer soon I need it asap I will give Brianlist 16. 4a – 8

Question

Please answer all quistion and show your work.Please answer soon I need it asap I will give Brianlist

16. 4a – 8 = 28

17. 5x – 2x = 15

18. 3(-4x + 7) = 57

19. 19 – 8x = x – 17

20. 5 + x÷8 = -4

in progress 0
Doris 5 days 2022-12-30T20:59:36+00:00 2 Answers 0 views 0

Answers ( 2 )

    0
    2022-12-30T21:01:24+00:00
    Answer: 16.a=9
                   17. -5  
    Step-by-step explanation:  16. 4a-8=28
    add 8 to both sides to start to isolate the variable (a)
    -8+8 cancels each other out
    28+8=36
    4a=36
    to completely isolate the variable divide both sides by 4
    4a÷4=a
    36÷4=9
    a=9
    17. 2*x-5*x-(15)=0
    Step by step solution :
    STEP
    1
    :
    Pulling out like terms
    1.1     Pull out like factors :
      -3x – 15  =   -3 • (x + 5)
    Equation at the end of step
    1
    :
    STEP
    2
    :
    Equations which are never true:
    2.1      Solve :    -3   =  0
    This equation has no solution.
    A a non-zero constant never equals zero.
    Solving a Single Variable Equation:
    2.2      Solve  :    x+5 = 0
    Subtract  5  from both sides of the equation :
                         x = -5

    0
    2022-12-30T21:01:31+00:00
    The solution to each of the linear equations are;
    16) a = 9
    17) x = 5
    18) x = -3
    19) x = 4
    20) x = 72

    How to solve linear equations?

    16) 4a – 8 = 28
    Add 8 to both sides to get;
    4a = 36
    divide both sides by 4 to get;
    a = 9
    17) 5x – 2x = 15
    3x = 15
    divide both sides by 3 to get;
    x = 5
    18) 3(-4x + 7) = 57
    Multiply out the bracket to get;
    -12x + 21 = 57
    -12x = 57 – 21
    -12x = 36
    divide both sides by -12 to get;
    x = -3
    19) 19 – 8x = x – 17
    Rearrange to get;
    x + 8x = 19 + 17
    9x = 36
    x = 36/9
    x = 4
    20) 5 + x÷8 = -4
    x/8 = 5 + 4
    x = 8 * 9
    x = 72
    Read more about Linear Equations at; https://brainly.com/question/13738662
    #SPJ1

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )