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WITCHER [35]
2 years ago
8

- 3х - 4y = 15 7x+y= 4 Substitution

Mathematics
1 answer:
Darya [45]2 years ago
3 0

Answer:

3x-4y=15

7x+y=4

Solve7x+y=4 for y:

7x+y=4

7x+y+−7x=4+−7x (Add -7x to both sides)

y=−7x+4

Step: Substitute −7x+4 for y in 3x−4y=15:

3x−4y=15

3x−4(−7x+4)=15

31x−16=15 (Simplify both sides of the equation)

31x−16+16=15+16 (Add 16 to both sides)

31x=31

(Divide both sides by 31)

x=1

Step: Substitute 1 for x in y=−7x+4:

y=−7x+4

y=(−7)(1)+4

y=−3(Simplify both sides of the equation)

Answer: x=1 and y=−3

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3 years ago
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Solve |12x + 1| = 10<br> (9/2, 11/2)<br> (-9/2, 9/2)<br> (-112.9/2)
Reil [10]

|12x + 1| = 10

Remove the absolute value term and make two equations:

12x +1 = 10

12x +1 = -10

Now solve for both x values:

12x +1 = 10

Subtract 1 from both sides:

12x = 9

Divide both sides by 12:

x = 9/12

12x +1 = -10

Subtract 1 from both sides:

12x = -11

Divide both sides by 12:

x = -11/12

The answer would be (-11/12, 912)

8 0
3 years ago
Jackie made $28 babysitting last week. her brother joe made only 86% as much as she did. how much did joe make?
strojnjashka [21]
Her brother joe made $52.08. First you need to make the percent into a decimal, like this 86% => .86. Then multiply .86 to $28. After that add what you got to $28.
7 0
3 years ago
HELP ASAP!!!!!!!!!!!!!! ITS AN EMERGENCY!!!!!!!!
laila [671]

Answer

Step-by-step explanation:

4 0
2 years ago
Divide £72 into the ratio 4 : 5.
algol13

Answer:

£32 : £40

Step-by-step explanation:

sum the parts of the ratio, 4 + 5 = 9 parts

Divide the amount by 9 to find the value of one part of the ratio

£72 ÷ 9 = £8 ← value of 1 part of the ratio, then

4 parts = 4 × £8 = £32

5 parts = 5 × £8 = £40

Then

£72 in the ratio 4 : 5 is £32 : £40

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3 years ago
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