Answer:
its option 4
Step-by-step explanation:
Let g be the number of grandchildren, and d be the number of dogs. They both have only one head, so the number of heads is
Grandchildren have 2 legs, while dogs have 4. So, the total number of legs is
From the first equation (the one for the heads) we can derive
Substitute this into the second to get
So, there are 9 dogs and (from the first equation
Answer:
The width of rectangle is or
Step-by-step explanation:
we know that
The perimeter of rectangle is equal to
where
L is the length of rectangle
W is the width of rectangle
we have
substitute
solve for x
simplify
<em>Find the width of rectangle</em>
substitute the value of x
Convert to mixed number
Answer:
can't see that
Step-by-step explanation:
<span>when you are solving systems of equation with three variables we use the elimination method to make a system of two equations in two variables</span>