Algebra

It does, thanks.

I'm currently working on solving algebraic equations with two variables (Example: 3x+4y=9). The computer lesson has taught me nothing but to solve the equation by trial and error -- selecting the proper ordered pair from a multiple choice list after plugging it in to see if it's correct. So, what happens when I don't have a convenient little list of ordered pairs to plug in? Is there a way to solve it from scratch like a one-variable equation?

There is a way to solve this problem from scratch.

You first find a value for either X or Y and then plug that instead of X or Y and solve for the other one.

3X + 4Y = 9

3X = 9 - 4Y

X = (9-4Y)/3

Now plug that instead of X to make it a one variable equation.

3[(9-4Y)/3) + 4Y = 9

That should result as Y=1

Than, plug 1 instead of Y to get X.

3X + 4(1)=9

that should result as X = 5/3

Than, plug the number for both X and Y.

3(5/3) + 4(1)=9

9=9

Hope it helps.

  1. 👍
  2. 👎
  3. 👁

Respond to this Question

First Name

Your Response

Similar Questions

  1. algebra

    Explain the difference between solving a system of equations by the algebraic method and the graphical method. Someone also wants to know why there are different methods for solving the same problem-what would you tell him?

  2. Math

    Is there a difference between solving a system of equations by the algebraic method and the graphical method? Why or why not?

  3. Calculus

    A curve is defined by the parametric equations: x = t2 – t and y = t3 – 3t Find the coordinates of the point(s) on the curve for which the normal to the curve is parallel to the y-axis. You must use calculus and clearly show

  4. pre calculus

    Create systems of equations in two variables that have (a) no solution, (b) one distinct solution, and (c) infinite solutions. Show that each system has the indicated number of solutions by using a graph or solving the system.

  1. math

    the sum of the ages of two siblings is 23 and the difference between their ages is 7. if frank is the older brother of beth, determine their ages by creating a pair of simultaneous equations and solving them. this is killing me i

  2. math

    Lesson 7: Solving Equations with Two Steps Math 6 B Unit 5: Graphing, Equations, and Inequalities the practice 1.b 2.c 3.b 4.b 5.c Lesson 7: Solving Equations with Two Steps Math 6 B Unit 5: Graphing, Equations, and Inequalities

  3. Algebra 2

    1.) Write a system of equations that has NO solution. 2.) If you wanted to eliminate the y variables in the system of equations below, what would you multiply the first and second equations by?( Do not solve the equation) 2x-3y=8

  4. mathematics

    6.8.7 - Quiz: Solving Equations with Fractions Quiz Part 1 Math 6 A - Cristarella / 6. Adding and Subtracting Fractions / 6.8. Solving Equations with Fractions 1A 2B 3B 4A 5B

  1. Physics

    You are given vectors A = 5.0i - 6.5j and B = -2.5i + 7.0j. A third vector C lies in the xy-plane. Vector C is perpendicular to vector A and the scalar product of C with B is 15.0. Find the x and y components to vector C. Here's

  2. algebra

    Can anyone help me to understand algebra? Right now I am working on Systems of Linear Equations in Two Variables and I do not understand any of it. Thank you.

  3. Math

    A particular Chemistry book costs $6 less than a particular Physics book. Two such Chemistry books and three such Physics books cost a total of $123. Construct two simultaneous equations and solve them using the substitution

  4. MATH HELP PLEASE!!

    Given a long algebraic equation, what are some strategies that you can use to make simplifying and evaluating the equation more efficient and accurate? How do inverse operations help solve algebraic equations? Give a real-world

You can view more similar questions or ask a new question.