2x + y = 18
2x - y = 22
thanks
2007-07-21 07:37:44 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
4x = 40
x = 10
20 + y = 18
y = - 2
2007-07-21 07:48:30 · answer #1 · answered by Como 7 · 0⤊ 0⤋
a million. in simple terms upload the two equations to a minimum of one yet another: 4x + 0y = 40 x = 10, and hence y = -2 2. Subtract the precise equation from the backside equation 3a - 0b = 12 a = 4, and hence b = 6 3. Substitution: n = 2m + 3 from first eq, and substituting into 2d: 3m = 2(2m + 3) - 9 3m = 4m - 3 m = 3, and hence n = 2*3 + 3 = 9
2016-12-14 15:30:55 · answer #2 · answered by ? 4 · 0⤊ 0⤋
2x + y = 18
+2x - y = 22
-------------------
(2x + 2x) + (y - y) = (18 + 22)
4x = 40
x = 10
Substitute x=10 into first equation:
2(10) + y = 18
y = 18 - 20
y = -2
Verify with 2nd equation:
2(10) - (-2) = 22
2007-07-21 07:47:15 · answer #3 · answered by Gorme 3 · 0⤊ 0⤋
2x + y = 18
2x - y = 22
----------------
4x = 40
x = 10
2x + y = 18
2(10) + y = 18
y = 18 - 20
y = -2
(10,-2)
2007-07-21 07:43:58 · answer #4 · answered by fofo m 3 · 0⤊ 0⤋
4x=40
x=10
20+y=18
y=-2
2007-07-21 07:46:04 · answer #5 · answered by Anonymous · 0⤊ 0⤋
add both equations and get
4x=40
x=10
2007-07-21 07:44:16 · answer #6 · answered by Kenneth H 3 · 0⤊ 0⤋
Good question. I'd like to piggyback and read the answers.
Is it ok, Y&A?
2007-07-21 07:52:24 · answer #7 · answered by Answernian 3 · 0⤊ 0⤋