Best Answer

If you have a problem like this:

x=y+4 (1)

8y+2x=58 (2)

...the substitution method is the best way of working out the values of X and Y.

We know that x is the same as y + 4, so we can replace the x in equation two with y+4. This changes equation 2 to:

8y+2(y+4)=58

We now need to expand the brackets, giving us...

8y+2y+8=58

The next step is to tidy up the equation. To do this, we should firstly simplify the two y terms as they have the same coefficient, and remove the 8 from the left side, giving us...

10y=50

Obviously, we now have to divide 50 by y, to give us:

y=5

We now know y, so by rearranging formula 1 a little, we get:

x-4=y

We know that y = 5, so x-4 is 5. We add 4 to the 5 to remove the -4 from the left side, leaving us with x=9.

Let's check if this works:

9=5=4 CORRECT

40+18=58 CORRECT

It works!

Q: What is substitution in math terms?

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idk im trying to figure it out myself..... lol jk gtg im doing homework.... =(

yes, because obviously you know how

principal(in terms of math)- the amount you borrow or deposit

Which property is demonstrated below? If t=s then s=t

You use substitution when you can solve for one variable in terms of the others. By substituting, you remove one variable from the equation, which can then be solved. Once you solve for one variable, you can use substitution to find the other.

Related questions

idk im trying to figure it out myself..... lol jk gtg im doing homework.... =(

you don't.

yes

yes, because obviously you know how

principal(in terms of math)- the amount you borrow or deposit

Which property is demonstrated below? If t=s then s=t

A math expression is a collection of math terms

A comparison in math terms is when you see if two problems are equal to each other.

You use substitution when you can solve for one variable in terms of the others. By substituting, you remove one variable from the equation, which can then be solved. Once you solve for one variable, you can use substitution to find the other.

ask your math teacher

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