This is sometimes true because when distributing the sign could either be either minus or plus...
If you multiply a positive number with a negative number it will be negative. If you multiply a negative by a negative it will be positive. If you multiply a positive with a positive it will be positive.
X+y=70
x=2y-5
x=larger number
y=smaller number
now plug in the value of x to only have one variable in the equation...
Way to solve for y:
(2y-5)+y=70
3y-5=70
add 5 on both sides...
3y=75
divide by 3 on both sides
y=25
1st way to solve for x:
now plug in y in the original equation...
x+25=70
subtract 25 on both sides...
x=45
2nd way to solve for x:
plug in y for the second equation...
x=25(2)-5
x=50-5
x=45
answer: the two numbers are 45 and 25.
Answer:9
Step-by-step explanation:
Answer:
Part a)
Part b)
Step-by-step explanation:
Part a) Set up a proportion to show the relationship between the distance in miles and the size of the map
we know that
The scale on a map is equal to
That means
1 inch on a map represent a 15 miles in real life
Part b) How far apart are the cities in real life?
Let
x -----> the distance in real life
using proportion
Answer:
$1,200
Step-by-step explanation:
Add: 100+30=130
Subtract: 130-10= 120
Multiply: 120*10= $1,200