x-5y=10
2x-10y=20
help me por favor...necessito help!! lol
please show work!!
2007-05-30 17:01:30 · 6 answers · asked by Riley 1 in Science & Mathematics ➔ Mathematics
x-5y=10
2x-10y=20
x=10+5y
10+5y-10y=20
5y-10y=20-10
-5y=10
y=-2
2x-10y=20
2x-10(-2)=20
2x+20=20
2x=0
x=0
2007-05-30 17:08:33 · answer #1 · answered by Anonymous · 0⤊ 0⤋
isolate x
x=10+5y
sub in to the second equation and solve
2(10+5y)-10y=20
expand
20+10y-10y=20
collect alikes
y=0
now do the same and solve for x
2007-05-30 17:14:55 · answer #2 · answered by Anonymous · 0⤊ 0⤋
x=10+5y
2(10+5y)-10y=20
20+10y-10y=20
0y=0 y=0
x-0=10
x=10
2007-05-30 17:52:50 · answer #3 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋
this is an identity, and there are infinite solutions
if you double the first equation, you find that it is the same as the second
2(x-5y = 10)
2x - 10y = 20
2007-05-30 17:06:24 · answer #4 · answered by r 3 · 0⤊ 0⤋
there are infinitely many solutions. both equations are the same. divide both sides of the second equation by 2 to see this.
2007-05-30 17:06:00 · answer #5 · answered by holdm 7 · 0⤊ 0⤋
infinite solutions
since the first equation is the same as the second question
2007-05-30 17:25:32 · answer #6 · answered by Toai-Nguyen N 2 · 0⤊ 0⤋