y=2x y=4x+12 using the substitution method

Question

what are the points? (x,y)

Answer 1

Just substitute 2x for y in the second equation.

 

2x = 4x + 12

-2x = 12

x = -6

 

Now substitute -6 for x in either equation.

 

y = 2(-6)

y = -12

 

So the point is (-6, -12)