Hello!
To solve this problem, we will use a system of equations. We will have one number be x and the other y. We will use substitutions to solve for each variable.
x+y=9
x=2y-9
To solve for the two numbers, we need to solve the top equation. The second equation shows that x=2y-9. In the first equation, we can replace 2y-9 for x and solve.
2y-9+y=9
3y-9=9
3y=18
y=6
We now know the value of y. Now we need to find x. We can plug in 6 for y in the second equation to find x.
x=2·6-9
x=12-9
x=3
Just to check, we will plug these two numbers into the first equation.
3+6=9
9=9
Our two numbers are three and six.
I hope this helps!
Answer:
43
Step-by-step explanation:
v+47 is equal to 90 degrees, because it's a right angle
v+47=90
to get 90 in this equation, v must equal 43.
that means v=43
Answer:
-15 < x
Step-by-step explanation:
Since all terms are a multiple of 4, it can be convenient to start by dividing the equation by 4.
-16 < 2 + x - 3
-15 < x . . . . . . add 1 to both sides, collect terms
Answer:
distance = 5+4 = 9 miles
(distance that a person travel)
displacement = 5-4 = 1miles
(displacement is the distance between the starting point and ending point)
distance≠displacement
SUM:
If the numbers are the same sign, the sum will be the same sign as the numbers.
If they are different signs, the sum will be the same sign as the number with the largest size.
DIFFERENCE:
If the numbers are of different signs, the difference will be the same sign as the first number.
If the numbers are of the same sign, the difference will be the same sign as the numbers if the first number has the larger size, and the opposite sign to the numbers if the second number has the larger size.