x-y=4
2x-2y=8
2006-10-25 14:59:26 · 5 answers · asked by lailani l 1 in Science & Mathematics ➔ Mathematics
You can either make a table of values for each equation and plot them, or get y by itself to find the slope and y-intercept for each equation and plot them. Then see if the two lines cross, are parallel, or are the same line (which will happen here). If they cross, the intersection point is the answer; if they are parallel, there is no answer; if they are the same line there are infinitely many answers (any point on the line).
2006-10-25 15:04:07 · answer #1 · answered by hayharbr 7 · 0⤊ 0⤋
x - y = 4
2x - 2y = 8
x - y = 4
x - y = 4
As you can see, they are both the same problem and therefore have infinate solutions.
For a graph, go to www.quickmath.com, click on Plot under Equations, then click Advanced, and hopefully you know where to go from there.
2006-10-25 15:42:21 · answer #2 · answered by Sherman81 6 · 0⤊ 0⤋
Tee Hee. It's a bit of a trick question. The equations are 'equivalent'. That means that they have the same solution. They represent the same line! The solution is the whole line.
2006-10-25 15:04:14 · answer #3 · answered by modulo_function 7 · 0⤊ 0⤋
I think your suppose to solve it and then graph it, remember it's y=...
hoped I helped 'cos I haven't done this in awhile =)
2006-10-25 15:02:29 · answer #4 · answered by pacific_crush 3 · 0⤊ 0⤋
graph them and find their point(s) of intersection.
y = x - 4
y = x - 4
These graphs are actually the same so all values of x satisfy the equation set!
2006-10-25 15:03:25 · answer #5 · answered by teh_popezorz 3 · 0⤊ 0⤋