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borishaifa [10]
3 years ago
11

8x+3y= 70; y=2 Solve for x.

Mathematics
2 answers:
Fynjy0 [20]3 years ago
8 0
<h3><u>Explanation</u></h3>
  • Given the equation.

8x + 3y = 70

with given condition where y = 2.

Therefore, substitute the value of y in the equation.

8x + 3(2) = 70 \\ 8x + 6 = 70

  • Solve the equation for x-term.

8x = 70 - 6 \\ 8x = 64 \\ x =  \frac{64}{8}  \longrightarrow  \frac{8}{1}  \\ x = 8

  • Answer Check by substituting the value of y and x in the equation.

8x + 3y = 70 \\ 8(8) + 3(2) = 70 \\ 64 + 6 = 70 \\ 70 = 70

Hence, the equation is true for x = 8 and y = 2.

<h3><u>Answer</u></h3>

<u>\large{x = 8}</u>

Nataliya [291]3 years ago
5 0

Answer:

8

Step-by-step explanation:

x is 8

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Number 8 and 9 pls, if u answer u get brainlist rank!
mylen [45]

Answer:

8.

Denote the equation : y = ax + b

Use the first 2 values of x and y in table:

3a + b = 21

5a + b = 35

Subtract the 2 equations:

=> 2a = 14 => a = 7 => b = 21 - 3 x 7 = 0

=> The solution is  y = 7x

9.

Denote the equation : y = ax + b

Use the first 2 values of x and y in table:

5a + b = 17

10a + b = 22

Subtract the 2 equations:

=> 5a = 5 => a = 1 => b = 17 - 5 x 1 = 17 - 5 = 12

=> The solution is  y = x + 12

Hope this helps!

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8 0
3 years ago
Whats the elasped time between 9:00 and 1:30
Tasya [4]

Answer:

4 hours and 30 minutes

Step-by-step explanation:

I'll assume you have a basic knowledge of time and know the sequence. So all you do is count to 1:00 and see how many steps you took. In this case 4, but then you have 30 minutes left. Add that to the 4 hours, and you have a total of 4 hours and 30 minutes of elapsed time.

Hope this helps :)

7 0
2 years ago
The sum of four and the product of three and a number x.
KIM [24]

Answer:

<h2>4 + 3x</h2>

Step-by-step explanation:

The product of three and a number x: 3 · x = 3x

The sum of four and the product of three and a number x:

4 + 3x

8 0
3 years ago
Help please i need it bad
evablogger [386]

Answer:

-13, -3

15, 2.6

Step-by-step explanation:

x, y are the numbers

x = 5y + 2

x×y = 39

(5y + 2)×y = 39

5y² + 2y - 39 = 0

the solution of a quadratic equation :

y = (-b ± sqrt(b² - 4ac))/2a

a = 5

b = 2

c = -39

y = (-2 ± sqrt(2² - 4×5×-39))/2×5 =

= (-2 ± sqrt(4 + 780))/10 =

= (-2 ± sqrt(784))/10 = (-2 ± 28)/10

y1 = (-2 + 28)/10 = 26/10 = 2.6

y2 = (-2 - 28)/10 = -30/10 = -3

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x2 = 5×-3 + 2 = -15 + 2 = -13

5 0
2 years ago
Pls help me i am struggling
deff fn [24]

Answer:

16 square inches

Step-by-step explanation:

4 x 4 = 16

4 0
3 years ago
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