Answer:
Step-by-step explanation:
Solution by substitution method
3x-4y=8
and 18x-5y=10
Suppose,
3x-4y=8→(1)
and 18x-5y=10→(2)
Taking equation (1), we have
3x-4y=8
⇒3x=4y+8
⇒x=(
4y+8)/
3 →(3)
Putting x=
(4y+8
)/3 in equation (2), we get
18x-5y=10
18(
(4y+8)
/3) -5y=10
⇒24y+48-5y=10
⇒19y+48=10
⇒19y=10-48
⇒19y= -38
⇒y=-
38
/19
⇒y= -2→(4)
Now, Putting y=-2 in equation (3), we get
x=4y+8
x=
(4(-2)+8)
/3
⇒x=
(-8+8)/
3
⇒x=
0/
3
⇒x=0
∴x=0 and y= -2
Since she used 12 marshmallows and 8 graham crackers to make the four s'mores, you can figure out that she used 2 graham crackers per s'more (8/4) and 3 marshmallows (12/4).
To keep the same amount of materials per s'more you would need 2 x 3 = 6 (so 6 graham crackers) and 3 x 3 = 9 ( so 9 marshmallows).
Answer: $160
Step-by-step explanation:
80%is the same thing as
Also , since we are using equivalent ratio , we will look for a way to write 200 in order to have equivalent of 100. That is 200 is the same as 100 x 2
Therefore : 80% of a 200 is the same
x 100 x 2
which is the same as 80 x 2
$160
Since the number 5 is in the tenths place, there are 5 tenths.