Post a New Question

Algebra

posted by .

Use substitution method to solve the linear system.

Can someone please check if I did this problem right? Thanks

X+y=12
X+3/2y=3/2

Y=21
x=-9

  • Algebra -

    To check, all you have to do is to see if your solution satisfies both equations.
    Your solution satisfies the first, but not the second, so there is an erro

    from the first: y = 12-x
    first I would multiply the second by 2 to get rid of fractions
    2x + 3y = 3
    now sub in the first
    2x + 3(12-x) = 3
    2x + 36 - 3x = 3
    -x = -33
    x = 33
    then y = 12-33 = -21

    x = 33 , y = -21

    check:
    in first:
    LS = x+y = 33-21 = 12 = RS
    the 2nd:
    LS = x + (3/2)y = 33 + (3/2)(-21)
    = 33 - 31.5 = 1.5 = 3/2 = RS

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

More Related Questions

Post a New Question