SOLUTION: solve the pairs of equations using the addition or subtraction method.
3w - 2z = 38
z = 2w - 18
This is as far as I got, but I don't know if it's right.
3w - 2z = 38
Algebra ->
Systems-of-equations
-> SOLUTION: solve the pairs of equations using the addition or subtraction method.
3w - 2z = 38
z = 2w - 18
This is as far as I got, but I don't know if it's right.
3w - 2z = 38
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Question 39536: solve the pairs of equations using the addition or subtraction method.
3w - 2z = 38
z = 2w - 18
This is as far as I got, but I don't know if it's right.
3w - 2z = 38
2w + z = 18 Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! (1) 3w - 2z = 38
(2) z = 2w -18
subtract 2w from both sides of (2)
z -2w = -18
rearrange the left side
-2w + z = -18
now we have
(1) 3w - 2z = 38
(2) -2w + z = -18
multiply both sides of (2) by 2
(1) 3w - 2z = 38
(2) -4w + 2z = -36
add (1) to (2)
-w = 2
multiply both sides by -1
w = -2
substitute w = -2 in (2)
z = 2*(-2) -18
z = -4 -18
z = -22
check by substituting w and z in (1)
3*(-2) - 2*(-22) = 38
-6 + 44 = 38
38 = 38
OK
