Let the two numbers be x and y.
According to your question;
x + y = 7
10y + x = 10x + y + 9
By equation 1 ; x = 7-y
Substituting the value of x ;
10y + ( 7 -y) = 10(7-y) + y + 9
9y + 7 = 70 -10y + y + 9
9y + 7 = 70 - 9y + 9
=> 18y = 70 -7 + 9
=> 18y = 72
=> y = 4
Substituting for x ;
x = 7 - y
=> x = 7 -4
=> x = 3
Thus, x = 3 and y = 4;
=> The number is 34.
This uses the concept of proportions.
.002 converted to a fraction is 2/1000, or 1/500.
We set up the proportion like so:
10/100 = .002/x
Solve for x.
Cross-multiply.
10 * x = .002 * 100
10 * x = .2
x = .2 / 10
x = .02
The answer is .02
20/100 = 0.2
0.2 * 39.50 = 7.90
They should leave a $7.90 tip.
5/100 = 0.05
39.50 * 0.05 = 1.975 and rounds to 1.98
They should pay $1.98 in sales tax.
Answer:
<em>x = -8; y = 0</em>
Step-by-step explanation:
x + 2y = -8
3x - 4y = -24
We will use the substitution method.
Solve the first equation for x.
x = -8 - 2y
Replace x of the second equation with <em>-8 - 2y</em>, and solve for y.
3<em>x</em> - 4y = -24
3<em>(-8 - 2y)</em> - 4y = -24
-24 - 6y - 4y = -24
-24 - 10y = -24
-10y = 0
y = 0
Now we substitute 0 for y in the first original equation and solve for x.
x + 2y = -8
x + 2(0) = -8
x + 0 = -8
x = -8
Solution: x = -8; y = 0
Answer:
10.15
Step-by-step explanation:
I divided the worth of clothe and the tax
