Solve the following equations and check your solution using substitution.

Mathematics

1 answer:

guajiro [1.7K]3 years ago

4 0

Answer:

$x=7$

Step-by-step explanation:

We can add the same quantity to both sides of the equations, and still have an equivalent equation. Let's add $x+2$ to both sides, then sum like terms

$5-x +x+2 = -2 +x+2\\5+2 = x\\7=x$

(this is the rule that allows us to move items from one side do the other of the equal sign by changing its sign)

At this point we have a solution, let's replace it to verify

$5-(7) = -2\\-2=-2$

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1) Luis hizo una excursión de 20 km 75 hm 75 dam 250 m en tres etapas. En la primera recorrió 5 km 5hm, y en la segunda 1 km 50

Aleks [24]

Answer:

21500 m

Step-by-step explanation:

We will divide this point into four parts and we will pass it by the meter:

Total: (20 km * 1000 m / 1 km) + (75 hm * 100 m / 1 hm) + (75 dam * 10 m / 1 dam) + 250 m = 20000 m + 7500 m + 750 m + 250 m = 28500 m

First stage: (5 km * 1000 m / 1 km) + (5 hm * 100 m / 1 hm) = 5000 m + 500 m = 5500 m

Second stage: (1 km * 1000 m / 1 km) + (50 dam * 10 m / 1 dam) = 1000 m + 500 m = 1500 m

The value of the third stage would be the subtraction between the total and the first and second stage:

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3 years ago

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