You can basically plug in the numbers for x and y into the options:
A. y/x = 3
12/4 = 3, so this one is right
B. xy = 3
12*4 = 48, so this is wrong
C. x = 3y
3*12 = 36, which is not x (4), so this is wrong
D. y = 3x
3*4 = 12, which is y (12), so this is right
So, A and D are right
Answer:
n=30
Step-by-step explanation:
1/4(n+2)=8
1/4n+2/4=8
1/4n+2/4-2/4=8-2/4=7 2/4
1/4n=7 2/4
1/4n (4)=7 2/4 x (4)
n=29+2=30
To find the total cost, you need equations. Let's make "x" the number of hours to complete the work.
Painting USA total cost = 75 + 25x
Upscale Home total cost = 40x
X+5=13+3x
Okay. First subtract 5 from both sides.
x + 5 = 13 + 3x
-5 -5
___ __
0 8
x = 8 +3x
Subtract 3x on both sides. (The 3x's get cancelled on the right side.)
x -3x = 8
-2x=8
Divide -2 on each side.
-2x 8
___ = ___
-2 -2
x=-4
Answer:
JK = 42 , KL = 78
Step-by-step explanation:
JK + KL = JL , substitute values
4x + 6 + 7x + 15 = 129 , that is
11x + 21 = 120 ( subtract 21 from both sides )
11x = 99 ( divide both sides by 11 )
x = 9
Then
JK = 4x + 6 = 4(9) + 6 = 36 + 6 = 42
KL = 7x + 15 = 7(9) + 15 = 63 + 15 = 78