This video teaches you how to use substitution to find the point on a graph (the x and y coordinates) where two separate equations would cross. Substitution is a trick of algebra that allows you to find this point without making a graph. The first step is to isolate one of the variables (x or y) in one of the equations. That way, you know that that variable is equal to everything on the other side of the equals sign from it. You can then take that whole side, and substitute it into the other equation where the variable you isolated originally was. Using this method you can isolate the other variable, and solve for it. Then you can use substitution for the other variable, plugging in the answer you already found and solve for the other one. Voila! Now you know both x and y coordinates and you have your answer. If you follow the steps in this video you will soon understand how to use substitution to solve math problems!
 Hot
 Latest

How To: Find a missing coordinate given: coordinate & equation

How To: Remember "greater than" & "less than" symbols

How To: Draw a circle with a compass for Geometry

How To: Perform short division

How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

How To: Find the area of a triangle when given 2 sides & angle

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the coordinate of a point

How To: Understand equivalent fractions

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Calculate Faster Than a Calculator

How To: Subtract a mixed number from a proper fraction in basic math

How To: Find the equation of a circle given: center & tangent

How To: Find a slope of a straight line with: Ax + By + C = 0

How To: Divide small numbers by big numbers

How To: Find a missing side of a triangle, similar to another

How To: Find the Radius of a Circle from Arc Length

How To: Do normal probability calculations on a calculator

How To: Cancel out in basic algebra

How To: Find a missing coordinate given: coordinate & equation

How To: Remember "greater than" & "less than" symbols

How To: Draw a circle with a compass for Geometry

How To: Perform short division

How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

How To: Find the area of a triangle when given 2 sides & angle

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the coordinate of a point

How To: Understand equivalent fractions

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Calculate Faster Than a Calculator

How To: Subtract a mixed number from a proper fraction in basic math

How To: Find the equation of a circle given: center & tangent

How To: Find a slope of a straight line with: Ax + By + C = 0

How To: Divide small numbers by big numbers

How To: Find a missing side of a triangle, similar to another

How To: Find the Radius of a Circle from Arc Length

How To: Do normal probability calculations on a calculator

How To: Cancel out in basic algebra
Be the First to Comment
Share Your Thoughts