2 answers:
Answer:

Step-by-step explanation:
The given equation is

We need to solve this equation for x.
Isolate variable x to solve this equation for x.
Add 3w on both sides.


Divide both sides by 7.

Cancel out common factors.

Interchange the sides.

Therefore, the formula for x is
.
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Answer:
30 pounds is 13.6078 kilograms.
13 x 16 = 208.
Mary's dog should be given 208 mg of medicine.
Answer:
-114 (The answer should be negative.)
Step-by-step explanation:
3 x -38 = -114
B. d - 0.2
20%= 20/100= 0.2
so price= d-0.2
Answer:
a) 3x + ky = 8
ky = 8 - 3x
x – 2ky = 5
x - 2(8 - 3x) = 5
x - 16 + 6x = 5
7x = 21
x = 3 (shown)
b) x-2ky = 5
sub x = 3, y = 1/2
3-2k(1/2) = 5
-2k = 2
k = -1