SAT

SAT, 06.07.2019 10:00, ciarapacheco

In which of the following systems can elimination be used to eliminate a variable by performing addition only? 2x – y = 8 x – 2y = 9 2x – y = 8 x – 2y = 9 2x – 4y = –2 5x – 2y = –2 2x + y = 8 3x – y = 4

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Mathematics, 29.06.2019 12:20, gonzmari457

Summary of methods to solve systems method equal values this method is most efficient when both equations in form example substitution -2x + one variable is alone on one side of one equation equations in standard form with opposite coeficients. x + 2y = 21 36 27 elimination: add to eliminate one variable. elimination: multiply one equation to eliminate one variable elimination: multiply both equations to eliminate one variable. equations in standard form. to eliminate multiplied to create opposite terms one equation can be 3.6+2y7 when nothing else works. in this case you could multiply the first equation by 3 and the second equation by-2. then add to eliminate the opposite terms. 3x + 2y = 7 problems 1 2x + y = 6 -2x + y = 2 2 -3x+ y0 -6x + 5y = -10 3. 2x - 3y = -9 x -2 4 y-x=4 2y+x=8 5. 2x - y = 4 6. 4x - 4y=14 2x - 4y - 8 7. 6x – 2y = -16 4.x+y=1 8. 6x - y = 4 6x + 3y = -16 9. 2x - 2y = 5 2x - 3y = 3

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Mathematics, 23.08.2019 08:30, vale2652

Substitution and elimination are two symbolic techniques used to solve linear equations. for example, if it is easy to set up an equation for substitution where 1 variable is on 1 side, then use that; for example, 4y=16+4x, you can easily divide by 4, get y=4+x (or y=x+4), and plug that into the other equation. in other cases where it may not be so easy fractions/decimals, etc., then you would probably rather use elimination. 1) the substitution method. this method is best utilized when one of the variables in one of the equations has a coefficient of 1 or -1, otherwise you will introduce fractions. substitution can also be used for nonlinear systems of equations. (2) linear combinations also called the elimination method, multiplication and addition method, my personal favorite as it can be done efficiently. it generalizes well to larger systems and is the underpinning of various other solution methods. as the name implies it requires the equations to be linear. you need to know both and be comfortable switching between them. can we get one for the elimination method too? also, can you solve the same problem using either of the two techniques?

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Mathematics, 01.10.2019 19:00, lberries08

Explain how to solve a system of three equations using the elimination method. write all the equations in standard form cleared of decimals or fractions. choose a variable to eliminate; then choose any two of the three equations and eliminate the chosen variable. select a different set of two equations and eliminate the same variable as in step 2. solve the two equations from steps 2 and 3 for the two variables they contain. substitute the answers from step 4 into any equation involving the remaining variable. check the solution with all three original equations.

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Mathematics, 13.10.2019 07:00, mojr1000

Which of the following best describes when the elimination method of solving systems of equations is most useful? a. the elimination method is most useful when adding the equations cancels out both x- and y-variables simultaneously. b. the elimination method is most useful when you can eliminate one of the variable terms from an equation by adding or subtracting another equation. c. the elimination method is most useful when the answer is zero. d. the elimination method is most useful when one equation can be substituted into the other.

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