math

Can someone please check my work?

Solve using substitution method

1. 3x+2y=12
x=52-6y
answer:-40.8 I am pretty sure that one is wrong.

Solve using elimination method

2. 2r-7s=-31
7r+2s=24
answer: (230/53,-468/53)

3.3x+4y=3
6x+8y=6
answer: No answer. problems eliminate eachother

asked by deedee
  1. 3(52-6y) + 2 y = 12
    156 - 18 y + 2 y = 12
    -16 y = -144
    y = 9
    x = 52 - 6(9) = 52 - 54 = -2

    posted by Damon
  2. Thank you Damon!
    Can you help me with the formula to solve by elimination?

    posted by deedee
  3. 3x+2y=12
    x=52-6y multiply everything by 3 on this line

    3x+2y=12
    3 x = 156 - 18y
    ---------------- subtract
    0 x + 2y = 12 -156 + 18 y
    0 = - -144 + 16 y
    y = 144/16 = 9 again

    posted by Damon
  4. 2r-7s=0
    7r+2s=53

    posted by Anonymous
  5. 6,174,000,000


    posted by mani

Respond to this Question

First Name

Your Answer

Similar Questions

  1. Linear Equations

    Can you please help solve this equation using the substitution method? I have tried and keep getting that X and Y = 7/2, but the answer in the book states no solution, inconsistent system. What am I doing wrong? Please help! Solve
  2. algebra

    Solve for s in this equation. Depreciation. D=C-s/n This is my answer D-C=C-s/n-c D-C=-s/n -n(D-C)=-s/n*(-n) -nD+nC=s s=n(C-D) Please chack to see if this is correct Looks fine to me. A slightly shorter (by 2 lines) rearragement
  3. math check answer

    Solve by elimination method 3x - 6y =4 3x - 6y =5 is the answer x=9 and I think it is inconsistant and not consistant
  4. Substitution Method in Algebra!HELP PLZ!

    Use the Substitution method to solve the system of equations. 3x + y = 5 4x - 7y = -10 multiply first equation by 4 multiply second equation by 3 thus both equations have same x or y value in this case it is the x value. 12x + 4y
  5. math

    Solve by elimination method. 2r-5s=-33 5r+2s=48 Solve by substitution method. 5x+6y=5 x-9y=40 I always get these two confused... can someone please help me with these two problems?? I would really appreciate it..
  6. math

    Solve by elimination method. 2r-5s=-33 5r+2s=48 Solve by substitution method. 5x+6y=5 x-9y=40 I always get these two confused... can someone please help me with these two problems?? I would really appreciate it..
  7. introductory algebra

    I had these problems on my test and for some reason got them wrong. Here are the problems: Solve: x-y=9 x+y=1 The test states that the answer is (5,-4) I've checked ,y work and used substitution to solve this and still get x=4,
  8. Algebra PLEASE HELP!!

    What advantages does the method of substitution have over graphing for solving systems of equations? Choose the correct answer below. A. Graphing cannot be used to solve dependent or inconsistent systems due to the nature of the
  9. algebra

    i need help with these problems (either a solution or how to plug them into a graphing calculator): 1) Solve by substitution or elimination 4/x + 1/y + 2/z = 4 2/x + 3/y - 1/z = 1 1/x + 1/y + 1/z = 4 2)Solve the system of
  10. Algebra 1

    bobpursey, In this problem you helped me with earlier: Solve using any appropriate method. y = 2× - 5, y = ½× + 1 Substitution, substitute for y. 2×-5=½ × + 1 3/2 x=6 x=4 y= 2*4-5=3 How did you choose which method you were

More Similar Questions