Math

17) solve this linear system using the method of substitution.
2y-x=-10
y= -3/2x-1

20) simplify then solve by substitution
2(x-4)+y=6
3x-2(y-3)=13

just need help with these 2.

asked by Ma names Jeff
  1. y= -3/2x-1
    which I assume means
    y = -(3/2)x - 1
    so use that

    2 [ -(3/2)x - 1 ] - x = -10

    -3 x - 2 - x = -10

    -4 x = -8

    x = 2 etc

    posted by Damon
  2. 2(x-4)+y=6
    3x-2(y-3)=13

    2 x - 8 + y = 6
    3 x - 2 y + 6 = 13

    2 x + y = 14
    3 x -2y = 7

    y = 14 - 2x use that

    3 x - 2 (14-2x) = 7
    3 x - 28 + 4 x = 7

    7 x = 35 = 7*5
    so
    x = 5
    go back and find y

    posted by Damon

Respond to this Question

First Name

Your Response

Similar Questions

  1. Substitution Method-Plz help

    Use the Substitution method to solve the system of equations. x + y = -4 x - y = 2 solve for x in the second equation. x= y+2 Put that in for x in the first equation: x+y=-4 (y+2) + y = -4 solve for y. Then, x= y+2 i don't get
  2. 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
  3. 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
  4. algebra

    Requesting help. (I must reckon, that X is a variable, and y is y-intercept) Q: Try to use the substitution method to solve the the linear system y=3x an y=3x-7. What do you notice? A) What happens when you graph it? B) Explain
  5. maths

    use the substitution method to solve the linear system. 1. 3x=9 -x+2y=9 3x/3 = 9/3 x = 3 -x(3)+2y = 9 -3+2y = 9 2y = 12 y = 6 is (3,6) correct? =========== also, can you please tell me how to solve these? use the linear
  6. 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
  7. math

    Use a substitution method to solve the linear system 2a=8 a+b=2
  8. Math 2 questions

    Use the substitution method to solve each linear system: -x+3y+1=0 3x-y+1=0 4x-3y=-13 -2x+y=4 Please help, thanks:):)!!!!
  9. math - hw help. plz

    How to I solve this linear system using method of substitution? 1/4x + 1/2y = -5/12 2x - y = -4/3
  10. TO ANY MATH HELPERS

    Pleeeese help! Use the substitution method to solve each linear system: -x+3y+1=0 3x-y+1=0 4x-3y=-13 -2x+y=4 Please help, thanks:):)!!!!

More Similar Questions