2x-5y=5
y=x+2
2007-11-26 17:08:31 · 4 answers · asked by robert78gdl 2 in Science & Mathematics ➔ Mathematics
2x - 5(x + 2) = 5
2x - 5x - 10 = 5
- 3x = 15
x = - 5
y = - 3
x = - 5 , y = - 3
2007-11-27 04:01:42 · answer #1 · answered by Como 7 · 3⤊ 1⤋
OK
2x-5y=5
y=x+2 ; lets substitute this in the first equation
2x - 5(x+2) = 5
2x - 5x -10 = 5
-3x = 15
x = -5
Substitute in the second equation
y = -5 + 2
y = -3
Check in first equation:
2(-5) - 5 (-3) = 5 ??
-10 + 15 = 5 ??
5 = 5 YES!!
Hope that helps.
2007-11-27 01:19:34 · answer #2 · answered by pyz01 7 · 0⤊ 2⤋
2x -2y = -4 from the second equation
2x -5y = 5
3y= -9 by subtracting the two equations
y = -3 so x=-5
2007-11-27 01:16:27 · answer #3 · answered by slim40 2 · 1⤊ 1⤋
2x-5y=5
y=x+2
2x-5(x+2)=5
2x-5x-10=5
-3x=15
x=-5
y=-3
2007-11-27 01:16:48 · answer #4 · answered by Momo 2 · 1⤊ 2⤋