3 years ago

X + 9y = 38 3x + 7 = 14

Mathematics

1 answer:

lana66690 [7]3 years ago

4 0

Answer:

x = -7, y = 5

Step-by-step explanation:

a) x + 9y = 38, b) 3x + 7y = 14

From a)

x = 38 - 9y ---- (Equation 1)

From b)

{3*(38 - 9y)} + 7y = 14 ----- (From equation 1)

114 - 27y + 7y -14 = 0

100 - 20y = 0

20y = 100

y = 5

From a)

x + (9*5) = 38 (substituting the value of y = 5)

x + 45 = 38

x = 38 - 45

x = -7

Hope, this will help

You might be interested in

Algebraic Reasoning please help!

stiv31 [10]

Answer:

$\left[\begin{array}{ccc}7\\4\\2\end{array}\right]$

The answer is a single-column matrix (7,4,2)

Step-by-step explanation:

In such multiplication of matrices, you have to proceed by multiplying each ROW of the first matrix by the COLUMN of the second matrix. So,

$\left[\begin{array}{ccc}3&6&1\end{array}\right] * \left[\begin{array}{ccc}2\\0\\1\end{array}\right] = (3 * 2) + (6 * 0) + (1 * 1) = 6 + 0 + 1 = 7$

then...

$\left[\begin{array}{ccc}2&4&0\end{array}\right] * \left[\begin{array}{ccc}2\\0\\1\end{array}\right] = (2 * 2) + (4 * 0) + (0 * 1) = 4 + 0 + 0 = 4$

and

$\left[\begin{array}{ccc}0&6&2\end{array}\right] * \left[\begin{array}{ccc}2\\0\\1\end{array}\right] = (0 * 2) + (6 * 0) + (2 * 1) = 0 + 0 + 2= 2$

I hope it helps.

5 0

3 years ago

Marcus wants to purchase new computers for his office staff. The bank grants him a single-payment loan of $22,000 for 182 days a

miv72 [106K]

Answer:

fff

Step-by-step explanation:

8 0

3 years ago

What is the solution to 11=c/-5 8?

ss7ja [257]

Is it c/-58, or is it c/-5 blank 8?

7 0

3 years ago

Ms. Neeson baked 30 cookies. 5 sixths of the cookies were oatmeal. How many oatmeal cookies did Ms. Neeson bake?

katen-ka-za [31]

Answer: u find 5/6 of 30 cookies. of means to multiply do 5/6*30=

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

25% of<br> what number is 21

Sergio [31]

21 is 25% of 84.......

8 0

3 years ago

Read 2 more answers

X + 9y = 38 3x + 7 = 14​

X + 9y = 38 3x + 7 = 14