Which value, when placed in the box, would result in a system of equations with infinitely many solutions?

y = 2x – 5

2y – 4x =

a. –10
b. –5
c. 5
d. 10

Question

Which value, when placed in the box, would result in a system of equations with infinitely many solutions?

y = 2x – 5

2y – 4x =

a. –10
b. –5
c.  5
d. 10

karolynxx · Answer

@sleepyjess  do you know what i have to do?

sleepyjess · Answer

First, let's get these into the same format. I would probably subtract 2x from both sides of the first equation.

karolynxx · Answer

so 2x-2y?

sleepyjess · Answer

Close, y - 2x = -5

So, 
y - 2x = -5
2y - 4x = ?

What do you notice between the x's and y's in each equation?

karolynxx · Answer

their all lined up in the same place

karolynxx · Answer

i got -10 and that was the anwser (: thank you!

sleepyjess · Answer

Yes, we did that to see the correlation between them :)

sleepyjess · Answer

Good! The second equation was double the first equation :3