Question

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

Can someone show me how?

Answer 1

are you trying to solve for x?

Answer 2

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

Answer 3

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

Answer 4

np

Answer 5

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

Answer 6

Thanks @triciaal I am going to write that down.