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Andrej [43]
3 years ago
7

-5x + 9y = 14 -3x + 9y = -6

Mathematics
1 answer:
Arte-miy333 [17]3 years ago
4 0
You can solve it by several ways, but easiest and shortest would be "By Elimination"

So, subtract 2nd equation from 1st, 
-2x = 20
x = -10

Substitute it in 2nd equation, 
-3(-10) + 9y = -6
30 + 9y = -6
9y = -6 - 30
y = -36/9
y = -4

In short, Your Answer would be: (-10, -4)

Hope this helps!
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Teresas restraunt bill comes to $29.99 before tax. If the sales tax is 6.25% and she tips the waiter 20%. What is the total cost
alisha [4.7K]

Answer:

$37.86

Step-by-step explanation:

Multiply 29.99 by 0.0625 to get the sales tax

29.99x0.0625=1.87

Multiply 29.99 by 0.20 to get the tip

29.99x0.20=5.998

Round 5.998 to 6

Add 1.87 to 29.99

29.99+1.87=31.86

Add 6 to 31.86

31.86+6=37.86


3 0
3 years ago
Quadrilateral ABCD is inscribed in this circle. What is the measure of angle c?
alexandr402 [8]
3x+x+20 = 180
4x = 180-20
4x = 160
x = 40

×+20+3x+2x+38+C=360
40+20+3×40+2×40+38+C=360
40+20+120+80+38+C=360
298+C=360
C=360-298
C =62°
4 0
3 years ago
The mean of this set of numbers <br> {20, 30, 40, 50, 60, 70, 80} is??
MatroZZZ [7]

Answer:

The answer is 50

Step-by-step explanation:

You add up all the numbers and divide the numbers by how many numbers there are.

3 0
3 years ago
Read 2 more answers
HELP!!!!!! I believe its B but I am not sure! :(
n200080 [17]

Answer:

A

Step-by-step explanation:

When solving for x as an exponent, we need to use logarithms in order to undo the operation and rearrange the terms. We use log rules to bring down the exponent and solve. Logarithms are the inverse operations to exponents and vice versa. We have one special kind of logarithm called the natural logarithm whose base is e. We write it as ln. Since our base is e here, we will use the natural logarithm to rearrange and isolate x.

e^{4x-1} =3

We begin by applying the natural logarithm to each side.

ln(e^{4x-1}) =ln(3)

Log rules allow use to rearrange the exponent as multiplication in front of the log.

(4x-1)ln(e) =ln(3)

ln e as an inverse simplifies to 1.

(4x-1)(1)=ln(3)

We now apply the inverse operations for subtraction and multiplication.

4x-1+1=1+ln(3)\\4x=1+ln(3)\\\frac{4x}{4} =\frac{1+ln3}{4} \\x =\frac{1+ln3}{4}

Option A is correct.

5 0
3 years ago
What decimal is equal to 3/10
Aleks [24]

Answer:

0.3

Step-by-step explanation:

6 0
3 years ago
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