3 years ago

−8x+9y=-21 -3x+9y=−36

Mathematics

1 answer:

lidiya [134]3 years ago

7 0

Answer:

x=-3 y=-5

Step-by-step explanation:

big brain

You might be interested in

Rewrite the expression as an equivalent power with a negative exponent.<br> a. 1/49<br> b. 27/125

Hunter-Best [27]

$\dfrac{1}{49}=\left(\dfrac{1}{7}\right)^2=7^{-2}\\
\dfrac{27}{125}=\left(\dfrac{3}{5}\right)^3=\left(\dfrac{5}{3}\right)^{-3}$

3 0

3 years ago

Simplify -7 1/9 - (-9 1/2)

guajiro [1.7K]

Answer:

Here: 2 7/18

Step-by-step explanation:

Hope this helped and brainlest please!

6 0

3 years ago

Read 2 more answers

Can you help me ( 25 points) asap

BartSMP [9]

A.
estimate: 8/5
quotient:1.6

b.
estimate: 7
quotient: 7

c.
estimate: 15/2
quotient:7.5

3 0

3 years ago

Read 2 more answers

Determine the range of the function.

Naya [18.7K]

Answer:

$Solution: f(x)\ge-5\\Interval:[-5,\infty)$

Step-by-step explanation:

Equation: $\frac{1}{4} x^2-5 = y$

1). $\frac{1}{4} x^2-5 = y$ → $\frac{x^2}{4}-5=y$

2). $\frac{x^2}{4}-5=y$ ∴ $a=\frac{1}{4}, b=0, c=-5$

3). $x_v=-\frac{b}{2a}$

$=-\frac{0}{2(\frac{1}{4})}$

$=0$

4). now plug $x_v$ into $y_v$

$y_v=\frac{0^2}{4}-5$

$=-5$

5). Minimum (0,-5) ∴ $f(x)\ge-5$

4 0

3 years ago

A 120 watt light bulb uses about 0.1 kilowatt of electricity per hour.if electricity costs $0.20 per kilowatt hour how much does

Ksivusya [100]

A 120 watt light bulb uses about 0.1 kilowatt of electricity per hour.if electricity costs $0.20 per kilowatt hour. Let's solve how much does it cost to have a bulb on for an hour. => 120 watt = 0.1 kilowatt per hour which costs 0.20 per kilowatt per => 0.1 kilowatt per hour * 0.20 = 0.02 dollars in an hour.

8 0

3 years ago

Read 2 more answers