Answer:
x = 911.25
Step-by-step explanation:
let the number be x
by putting the word problem in equation, we get :
- 80/100 × x = 135/100 ×540
- 4/5 × x = 135/10 × 54
- x = 135/10 × 54 × 5/4
- x = 911.25
Step-by-step explanation:
x+8=10
x−4=22
x÷3=6
7x=28
60=30+30=6+6+6+6+6+6+6+6+6+6
a=a
a=b,thenb=a
60=30+30,then30+30=60
ifa=bandb=c,thena=c
60=30+30
30+30=6+6+6+6+6+6+6+6+6+6
60=6+6+6+6+6+6+6+6+6+6
The answer is B. (15,18)
Solution:
First, let's set the variables first.
X = dollars per hour to clean the floor
Y = dollars per hour to clean the rest of the house
For the first statement, "<span>2 hours to clean floors and 3 hours to clean the rest of a house, the total charge is $84"
We can put it into an equation.
2X + 3Y = 84 </span>⇒ equation 1
For the first statement, "<span>1 hour to clean floors and 4 hours to clean the rest of a house, the total charge is $87'
X + 4Y = 87 </span>⇒ equation 2
Multiply first equation 2 by 2 to make the coefficient of both equations 1 and 2 the same.
Using elimination method in solving for x and y,
(equation 1) 2X + 3Y = 84
(equation 2) 2(X + 4Y) = 87
2X + 8Y = 174 ⇒ equation 3
Next, subtract equation 3 from equation 1.
2X + 3Y = 84
- (2X + 8Y = 174)
-------------------------
- 5Y = -90
Y = 18
Find X when Y = 18
@ equation 1 : 2X + 3Y = 84
2X + 3(18) = 84
2X + 54 = 84
2X = 84 - 54
2X = 30
X = 15
The answer is in ordered pairs of cleaning the floors and to clean the rest of the house. So, in the form (X,Y).
Answer: (15,18)
Answer:
-7
Step-by-step explanation:
