Question

how to solve by substitution?

Answer 1

sub·sti·tu·tion [sùbstə tsh'n]
(plural sub·sti·tu·tions)
noun
1. act of replacing: the replacement of somebody or something with another, especially one team member with another on the field
2. somebody or something that replaces: somebody or something that replaces another, especially one team member who replaces another on the field
3. mathematics replacement of mathematical element: the replacement of one mathematical element with another of equal value
4. logic replacement of logical expression: the replacement of one logical expression with another, or a replaced logical expression

Answer 2

thanks soty for copying the definition thats not what i need!!!!!!!!!!!

Answer 3

nevermind closing question now...

Answer 4

you use substitution by finding the value for a variable then putting it into the other equation
ex:


4x+3y=10 and x+2y=10

STEP1: x=-2y+10 solve one equation for x.
STEP2: 4(-2y+10)+3y=10 substitute the expression for x into the other equation

-8y+40+3y=10 distribute
-5y=-30 combine like terms
y=6 solve for y


STEP3: x+2(6)=10 substitute the y value into either equation
x+12=10 simplify
x=-2 solve for x

SOLUTION (-2,6)