y=3x, 4x-2y=5
a. - 15/2
b. -5/2
c. 11/6
d. 5/2
e. 15/2
2007-05-29 17:44:03 · 5 answers · asked by tehmonkii 2 in Science & Mathematics ➔ Mathematics
Solve for the "x" variable. The problem gives us the number for the "y" variable.
First: replace 3x with "y" in the equation.
4x - 2y = 5
4x - 2(3x) = 5
4x - 6x = 5
- 2x = 5
Sec: isolate "x" by dividing both sides by -2.
- 2x/-2 = 5/-2
x = -5/2
2007-05-29 17:56:01 · answer #1 · answered by ♪♥Annie♥♪ 6 · 0⤊ 0⤋
I'm assuming you're solving for "x":
Combine the two equations together:
4x - 2 (3x) = 5
Simplify the equation:
4x-6x = -2x = 5
Solve for x:
x = -5/2
2007-05-29 17:53:15 · answer #2 · answered by Anonymous · 0⤊ 0⤋
y=3x
so, substitute for y
4x -2(3x)=5
4x - 6x -5
-2x = 5
x=-5/2
2007-05-29 17:46:48 · answer #3 · answered by nobody2000 3 · 1⤊ 0⤋
4x - 6x = 5
- 2x = 5
2x = - 5
x = - 5 / 2
Answer b)
2007-05-29 20:01:57 · answer #4 · answered by Como 7 · 0⤊ 0⤋
y=3x
4x-2y=5
4x-2(3x)=5
4x-6x=5
-2x=5
-x=5/2
x=-5/2
y=3x
y=3(-5/2)
y=-15/2
2007-05-29 18:47:38 · answer #5 · answered by sam 3 · 0⤊ 0⤋