If -2x+3=7 and 3x +1=5+y, the value of y is...
(A) 1 (B) 0 (C) -10 (D) 10
i know i can just plugin each mulitple choice into the problem but i can't show my work like that..
thanks a bunch for whoever can help me with this problem
2007-12-02 08:49:30 · 5 answers · asked by Blah 4 in Science & Mathematics ➔ Mathematics
Use the 1st equation to solve for x
so -2x + 3 = 7, so -2x = 4, so x = -2
then plug this into the 2nd equation:
3(-2) + 1 = 5 + y
-6 + 1 - 5 = y
y = -10
2007-12-02 08:52:39 · answer #1 · answered by Allison 2 · 0⤊ 0⤋
-2X + 3 = 7 3(-2) + 1 = 5 + Y X = -2
- 3 = 7-3 -6 + 1 - 5 = Y Y = -10
-2X = 4 - 10 = Y
----- -----
-2 -2 Check: -6 + 1 = 5 + (-10)
X = -2 -6 +(-5) + 1 = -10
Subtract 5 from both sides.
2007-12-02 09:18:11 · answer #2 · answered by gzlakewood@sbcglobal.net 4 · 0⤊ 0⤋
-2x+3=7
-3 -3
-2x=4
/-2 /-2
x=-2
3(-2)+1=5+y
v
-6+1=5+y
v
-5=5+y
-5 -5
-10=y
(C)
2007-12-02 08:59:54 · answer #3 · answered by Harris 6 · 0⤊ 0⤋
-2x = 4 so 2x = -4 so x = -2,
substitute:
(3*-2) + 1 = 5 + y,
(3*-2) +1 -5 = y,
y= -10 ans (C).
2007-12-02 09:03:34 · answer #4 · answered by BB 7 · 0⤊ 0⤋
-2x = 4
x = -2
3(-2) - 4 = y
-6 - 4 = y
-10 = y
so the answer is c
2007-12-02 08:53:14 · answer #5 · answered by Ms. Exxclusive 5 · 0⤊ 0⤋