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Q: What does 15--13 equal 15 --13 equals 28 because a minus and a minus equals a plus so the equation is actually 15 plus 13 equals 28?

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If it has an equals sign it is called an equation. without an equal sign is called and expression because it expresses what is happening for example. x^2*x*1 is just an expression stating something u don't actually have an answer.

A formula does not have an equal sign. An equation has an equal sign. That's why it is an equation.

it's actually quite simple, you just have to think a little, the equation would be... 9-(9 divided by 9) ^^= 8 because 9 divided by 9 equals 1 and 9 minus 1 equals 8!

equal

It equals to the equation of a straight line.

Yes, it does. An equation is something that equates something to something else, by means of the 'equals' sign.

28

The property is: If equals are subtracted from equals, the results are equal.

An "equals" sign. That's why it is an equation, two parts are equal.

The equation is true because of the reflexive property of equality which states in words that every quantity is equal to inself.

I don't see an equation. An equation must have an equal sign. For a question in answers.com, you'll have to write the word "equals", since symbols get lost.

441

In an equation, what is to the left of the equals sign equals what is to the right. In an inequality, the left side is either less than, greater than, less than or equal to, or greater than or equal to the right side.

the answer is 33.333333333

Yes and they will be of equal value

x=0

The first equals the second because they're the same total on each side of the equals sign. Try it with grapes, then you can eat your equation.

Equal sums on both sides of the equation would be 29 + 29 = 58

It's not an equation and therefore unsolvable until it equals something.

y = -2.5 is a equation. And solution to the equation is finding the value of the variable. If we see the equation y is already equal to -2.5 which is the solution to the equation.

No. -4 does not equal -2(1).

I think you mean this as an answer, not a question. An expression does not have an equals sign (e.g 2x4). An equation does have an equals sign (e.g 2x4=8).

Yes it is the equation for a vertical line (parallel to the y-axis), intersecting the x-axis at the point (3,0). There is not a y component in this equation, because at any value of y, x will always equal 3.

That makes no sense, there is no y in the equation so y cannot equal anything.