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Darya [45]
3 years ago
5

I need to solve these and don't know how to plz help thank you

Mathematics
1 answer:
nadezda [96]3 years ago
5 0
1. 
x + y = 5 ⇒ x = 5 - y 
2(5 - y) - y = 7 (substitute)
10 - 2y - y = 7 (distribute)
10 - 3y = 7 
-3y = -3 (subtraction)
y = 1(divide)

x + (1) = 5 (substitute then solve)
x = 4

2.
–4x – 6(–2x + 6) = 4 (substitute)
–4x + 12x – 36 = 4  (solve)
8x –36 = 4
8x = 40
x = 5

y = –2(5) + 6
y = –10 + 6
<span>y = –4

3.
3x + y = 7 </span>⇒ y = 7 - 3x
<span>-7x - 5(7 - 3x) = 25
-7x - 35 + 15x = 25
8x - 35 = 25
8x = 60
x = 7.5

y = 7 - 3(7.5)
y = 7 - 22.5
y = 15.5

4.
x + 3y = 9 </span>⇒ x = 9 - 3y
<span>2(9 - 3y) + 4y = 7
18 - 6y + 4y = 7
- 2y + 18 = 7
- 2y = -11
y = 5.5

x = 9 - 3(5.5)
x = 9 - 16.5
x = - 7.5
</span>
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7 0
4 years ago
Would like to see the step-by-step how to solve this!
tiny-mole [99]

The solutions to the respective equations shown in the image are 220, 41, -52, 1.385 and 11

<h3>What is an equation?</h3>

An equation is an expression that shows the relationship between two or more numbers and variables.

a) 23 + (-16) + 42 * 5 - (-3)

= 23 - 16 + 210 + 3 = 220

b) -6(12 - 15) + 23

= -6(-3) + 23 = 18 + 23

= 41

c) -50 + (-10) + (5 - 3)4

= -50 - 10 + 2(4) = -50 - 10 + 8

= -52

d) -4.5 (-0.53) + (-1)

= 2.385 - 1

= 1.385

e) 5 - 2 + 8

= 3 + 8

= 11

The solutions to the respective equations shown in the image are 220, 41, -52, 1.385 and 11

Find out more on equation at: brainly.com/question/2972832

#SPJ1

8 0
2 years ago
Find the value of this expression if x = 5 and y = -1
geniusboy [140]

Answer:

5/6

Step-by-step explanation:

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3 years ago
Jack divided his fortune of 92,000 into 8 equal portions.He gave 4 portions to his wife , 1 portion to his son and divided the r
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Answer:

Step-by-step explanation:

Given that Jack divided his fortune of 92,000 into 8 equal portions.He gave 4 portions to his wife , 1 portion to his son and divided the remaining portions equally among 5 charities.

The portion son gets = 1/8 of 92000 = 11500 $

Charity on the whole gets = 3 portions = 3/8 *92000 = 34500$

Each charity gets = 34500/5 = 6900$

Thus we find son gets 11500 dollars while each charity gets 6900 dollars.

The difference = 11500-6900\\= 4600

4600 dollars he got more.

5 0
3 years ago
Mr. Loza had to stop at 7-Eleven for gas on his way to school. He bought four gallons of gasoline for $16.80. How much is the pr
mihalych1998 [28]

Answer:

Every gallon costs $4.20

Step-by-step explanation:

If you divide the money he spent and the gallons he needed, you come up with a total price of $4.20 a gallon. For the amounts of gallons he could get with $40 bucks, he would have 9.5 gallons, as you just need to divide 40 by 4.2. I hope this helps :)

4 0
3 years ago
Read 2 more answers
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