Can sb explain why there's letters in math...????

1 answer:

5 0

They're called variables (this sounds like vary because the number that a letter could represent varies) so when i say 1 + x = 3 it is saying that they don't know the value of x yet but of course you can solve that by subtracting 1 from 3 which is 2

You might be interested in

Mrs Connors went to a shopping mall and spent 3/5 of the money she had in her wallet on buying new pots and pans how much money

oksano4ka [1.4K]

She will pay $126 for the pots and pans. Hope it help!

6 0

4 years ago

Read 2 more answers

Help me solve this problem <br> 2|m/2|-1>3

nexus9112 [7]

Answer:

is this even a equation

Step-by-step explanation:

7 0

3 years ago

The amount of protein a person needs each day is proportional to his or her weight. Rod weighs 165 pounds and needs 60 grams of

lukranit [14]

The equation for this would be: $\frac{60}{165}= \frac{x}{220}$ . first you want to multiply 60 by 220, then divide the product by 165. 60 times 220 is 13,200. Now divide 13,200 by 165. This will give you 80. Todd has to eat 80 grams of protein each day to stay healthy.

6 0

3 years ago

Solve the following problem by defining your variables and writing a system of equations:

serious [3.7K]

Answer:

1 donut and a bag of coffee costs $4.50

Step-by-step explanation:

Start by creating a pair of simultaneous equations.

Let $x =$ a donut.

Let $y =$ a bag of coffee.

Therefore:

$8x+2y=18$

$3x+y=7.50$

There are a few ways to solve these equations. This time I'll show you the elimination method. We eliminate one of the variables to get the other variable equal to a number.

Start by multiplying one of the equations by a number so that one of the variables has the same coefficient (number at the front) as the same variable in the other equation.

I'll multiply the second equation by 2 so that the $y$ will have a coefficient of 2 like the 1st equation.

$2(3x+y)=2(7.50)$ , $6x+2y=15$ .

Now we have two equations with the same coefficient of $y$ . We can subtract the equations from each other to eliminate the $y$ variable and leave $x$ equal to a number.