Answer: x=2 and y=4/3
Step-by-step explanation:
To solve by substitution method, you want to solve for one variable, and plug it into the other equation.
Let's solve for y in 2x+3y=8.
[subtract both sides by 2x]
[divide both sides by 3]
Now that we have y, we can plug it into the second equation.
[plug in y]
[multiply 3 and y to cancel out the 3]
[distribute -1 to 8-2x]
[combine like terms]
[add both sides by 8]
[divide both sides by 11]
Since we know the value of x, we can substitute it back into any of the 2 equations to find y.
[plug in x=2]
[multiply 2 and 2]
[subtract both sides by 4]
[divide both sides by 3]
Our final answer is x=2 and y=4/3.
<h3>
Solution (a):</h3>
<em>~Let's change 9.9² to 10² since we have to estimate.~</em>
<u>We know that:</u>
- 10² = 100
- Given expression: 9.9² × 1.79
<u>Solving the expression:</u>
- 9.9² × 1.79
- => 10² × 1.79
- => 100 × 1.79
- => 179
The estimated value of 9.9² × 1.79 is 179.
<h3>Solution (b):</h3>
<em>~Let's change √97.5 to √100 and 1.96 to 2</em> <em>since we have to estimate.~</em>
<u>We know that:</u>
- √100 = 10
- Given expression: √97.5 ÷ 1.96
<u>Solving the expression:</u>
- √97.5 ÷ 1.96
- => √100 ÷ 2
- => 10 ÷ 2
- => 5
The estimated value of √97.5 ÷ 1.96 is 5.
Given h(x)=5x-3 and j(x)=-2x.
So, j(2) = -2*2 = -4
So, h[j(2)] = h(-4)= (5*-4) -3 = -20-3 = -23
Hence option D is correct.
Responder:
462 assentos
Explicação passo a passo:
Dado que :
Número da linha = 12; Número de assentos por fila = 16
Número de linhas = 15; número de assentos por fila = 18
Número total de assentos para as 12 filas:
12 * 16 = 192 assentos
Número total de assentos para as 18 filas:
15 * 18 = 270 assentos
Número total de assentos:
(192 + 270) = 462 assentos
42.7/7= 6.1
36.48/6=6.08
7.29/9=0.81