How do u solve this its pre-algebra 4x – 5y = 20

Mathematics

2 answers:

Nuetrik [128]3 years ago

4 0

Answer:

x = 5 + 5y/4

Step-by-step explanation:

I think its like this: 4x - 5y = 20

Add 5y to both sides: 4x = 20 + 5y

Divide both sides by 4: x = 20/4 + 5y/4

Simplify: x = 5 + 5y/4

I'm pretty sure it is like this

Hope this helps!

kykrilka [37]3 years ago

3 0

Answer:

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Step-by-step explanation:

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In the course of a short race, a car does 50,000 J of work in 7 s. What is the power of the car during the race? (round to the n

nirvana33 [79]

Answer:

Work done is the product of distance and force, it is measured in joules.

Power is the rate of work done given by dividing the work done by time

Power (watts)= workdone (J)/ time (s)

= 50,000J/7 sec

= 7142.857 watts

Therefore, the power of the car during the race was 7142.857 watts

Step-by-step explanation:

4 0

3 years ago

The sum of two numbers is 30. If three times the smaller number is equal to two times the bigger one, find the numbers.

MAVERICK [17]

Let the smaller number be x and the bigger number be y.
Therefore, 3x = 2y $= > x = \frac{2y}{3}$ $x + y = 30 \\ = > \frac{2y}{3} + y = 30 \\ = > \frac{2y + 3y}{3} = 30 \\ = > \frac{5y}{3} = 30 \\ = > y = \frac{30 \times 3}{5} \\ = > y = 18$
Therefore, the smaller number = 30 - 18 = 12