Question

Help! i'll give a medal.

Answer 1

2x - 5y = 10
4x - 10y = 20 ?
2x + 5y = 10
4x + 10y = 20 ?
2x + 5y = 10
4x - 10y = 20 ?
2x - 5y = 10
4x + 10y = 20 ?

Answer 2

since they are collinear they should be multiples of each other, which i think is the second choice because of the graph's behavior..

Answer 3

O.o whaaa

Answer 4

you can only see one graph right? so it means the graph overlaps, or it means that the intersection is infinity (it will go on and on).. we call it here as collinear. If the graphs are collinear, the equations should be multiples of each other. so you only have two choices left.. the first one and the second one..
but if you will look at the end behavior of the graph it goes from left to right, which means that the slope of negative.. if you will arrange the equation into slope-intercept form (y=mx+b) the second choice will give you a negative slope, so that's the answer for me..