y=2x+5
4x+y =2
2007-07-17 05:39:34 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
#1: y=2x+5
#2: 4x+y =2
Since #1 is already solved for one variable, just substitute it into #2.
4x + (2x + 5) = 2
6x = -3
x = -1/2
Now, put that into either equation to find y.
y = 2x + 5
y = 2(-1/2) + 5 = -1 + 5 = 4
2007-07-17 05:42:56 · answer #1 · answered by Mathematica 7 · 1⤊ 2⤋
All you have to do is plug one equation into the other.
So with,
4x+y=2
sub 2x+5 for y,
and you have
4x+(2x+5)=2
so
6x +5=2
6x=-3
x= (-1/2)
so now y= 2*(-1/2)+5
y=4
2007-07-17 05:47:03 · answer #2 · answered by Anonymous · 2⤊ 0⤋
4x + (2x + 5) = 2
6x + 5 = 2
6x = - 3
x = - 1/2
y = - 1 + 5
y = 4
x = (-1/2) , y = 4
2007-07-17 06:57:20 · answer #3 · answered by Como 7 · 2⤊ 0⤋
4x + (2x + 5) = 2
6x + 5 = 2
6x = -3
x = -1/2
y = 4
2007-07-17 05:43:52 · answer #4 · answered by Becky M 4 · 2⤊ 0⤋