What is the solution of the system?
2x - y = -7
4x - y = -4

Can someone show me how?

Question

What is the solution of the system?
2x - y = -7
4x - y = -4

Can someone show me how?

anonymous · Answer

are you trying to solve for x?

freckles · Answer

like notice the y in both equations have the same sign
multiply one of the equations by -1
then add the equations together
this way the y's will be eliminated and you can solve for x

anonymous · Answer

Oh okay I understand. I was trying to do something else. I feel dumb now. Thanks so much freckles!

freckles · Answer

np

triciaal · Answer

another approach
2x + 7 = y  from eqn 1 and 4x +4 = y from eqn 2 
set the y;s equal
2x + 7 = 4x + 4 
solve for x 
-2x = -3
x = 3/2 
substitute to get y value using either eqn 
y = 2(3/2) + 7 = 10
y = 4(3/2)+ 4 = 6 + 4 = 10

anonymous · Answer

Thanks @triciaal I am going to write that down.