In the diagram below of triangle B
C
D
BCD,
E
E is a midpoint of
B
C
‾
BC
and
F
F is a midpoint of
C
D
‾
CD
. If
E
F
=
2
x
+
4
EF=2x+4, and
B
D
=
10
x
−
40
BD=10x−40, what is the measure of
E
F
EF?

5x+10 is the correct one

hope this

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

for me what is finding a good play list and going out because i can not lay down and relax so i usually go to a coffee shop. i also use the gum trick and this actually works. another advice is highlighting subjects it really does me remember certain things

step-by-step explanation: