How many solutions exist for the system y = 2x + 5 and y = -0.2x - 4?
A. no solution
B. one solution
C. infinitely many solutions

Question

How many solutions exist for the system y = 2x + 5 and y = -0.2x - 4?
	A.	no solution
	B.	one solution
	C.	infinitely many solutions

amistre64 · Answer

if we scale the 2nd by -4 we get 2x + 16

amistre64 · Answer

same x parts different constants; no solutions

amistre64 · Answer

opps, read .5 instead of .2

amistre64 · Answer

same concept tho :)

amistre64 · Answer

y =  2x  + 5
-y = 0.2x + 4
-------------
0 = 2.2x + 9

x = -9/2.2

amistre64 · Answer

if that x produces the same ys were good

amistre64 · Answer

http://www.wolframalpha.com/input/?i=y+%3D+2x+%2B+5+and+y+%3D+-0.2x+-+4 says were good with one solution

anonymous · Answer

Change -0.2 to -(2/10) and solve the following for x and y:$$\left\{y=2 x+5,y=-\frac{x}{5}-4\right\} $$$$\left\{x=-\frac{45}{11},y=-\frac{35}{11}\right\} $$