3x+7=-x-1
move -x to the other side
sign changes from -x to +x
3x+x+7=-x+x-1
3x+x+7=-1
4x+7=-1
move 7 to the other side
sign changes from +7 to -7
4x+7-7=-1-7
4x=-8
Divide by 4 for both sides
4x/4=-8/4
Answer: x=-2
Answer:
area = (1/2)|Ax(By-Cy) +Bx(Cy-Ay) +Cx(Ay-By)|
= (1/2)|2(3-6) +3(6-1) +1(1-3)| = (1/2)|-6 +15 -2|
area = 7/2
learn at brainly.com/question/17119045
Y+2=7(x-1)
y+2 = 7x-7
-2 -2
----------------
Y=7x-9
Answer:
8 km per hour or 8 km/hr
Step-by-step explanation:
If riding 4 km took her 1/2 an hour then you multiply by 2 to get 8 km for 1 hr. 8 km for 1 hour means she was going 8 km per hour.
