X=one type that cost 9
y=one type that cost 8
total books=type1+type2
total books=13
x+y=13
the total cost=cost of each added together
cost of each=number of books times cost per book
total cost=108
9x+8y=108
we have
x+y=13
9x+8y=108
solve for x and y
multiply first equation by -8 and add to first equation
-8x-8y=-104
<u>9x+8y=108 +</u>
x+0y=4
x=4
subsitute
x+y=13
4+y=13
minus 4
y=9
4 of the $9
9 of the $8
thats how to solve
Answer:
13,586400000000001 per time
Step-by-step explanation:
We can write a proportion: 15 m is to 12 m as some other height
is to 20 m
So we get
So the second tree is 25 m tall.
-2(-5+4n)-4(3+6n)
10-8n-12-24n
-2-32n
Answer:
Step-by-step explanation:
is supplementary to