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3 years ago

3x + 5 = 2x + 7 What should you do first to isolate the variable?

Mathematics

2 answers:

Alja [10]3 years ago

8 0

Answer:

you can subtract 2x from both sides

Then subtract 5 from both sides.

x = 2 is what the equation gives you

Step-by-step explanation:

You can do one of two things.

1. You can subtract 2x from both sides of the equation

2. You can subtract 5 from both sides of the equation.

Either one will give you the correct answer.

3x - 2x + 5 = 2x - 2x + 7 Combine the xs

1x + 5 = 7 Subtract 5 from both sides.

x + 5-5 = 7-5

x = 2

ch4aika [34]3 years ago

6 0

Answer:

subtract the lowest variable from the highest variable.

Step-by-step explanation:

3x+5=2x+7

1x+5=7

add the 5 to the 7

divide 12 and the 3x

Answer: 4.

x=4

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SVETLANKA909090 [29]

Answer:

$y=5.63$

Step-by-step explanation:

Given

$y$ varies directly with $x$

This means

$y$ ∝ $x$

This can be written as:

$y=k\ x$

where $k$ is the constant of proportionality.

We know that when $x=8$ then $y=5$ . Using this we can find value of $k$ .

so, we have

$5=k(8)$

Dividing both sides by 8 to isolate $k$ .

$\frac{5}{8}=\frac{k(8)}{8}$

∴ $k=\frac{5}{8}$

when $x=9$ then $y$ will be

$y=\frac{5}{8}\times 9$

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