Substitute this result into (b):\ b.

A+2(2A)=5

\ Solve for the unknown that remains:\ b.

A+4A=5->5A=5->A=1

\ Substitute this result into either of the original two equations to solve for the other variable\ a.

2(1)-B=0->B=2

\ Part A - Isolating a Variable\ Isolating a variable in two equations is easiest when one of them has a coefficient of 1 . Let's say we have the two equations\

3A-B=5

\

2A+3B=-4

\ and want to isolate one of the variables, such that it appears by itself on one side of the equation. Which of the following is an equation with one of the above variables isolated?\ View Available Hint(s)\

B=3A-5\ 2A=-3B-4\ 3B=-2A-4\ B=5-3A

\ Part B - Substitution\ Now that we have one of the variables from Part A isolated, and written in terms of the other variable, we can now substitute this into the other of the two original equations. Which of the following options represents this?

2. Substitute this result into (b): b. A+2(2A)=5 successfully complete this primer will be able to: ituations that involve solving two equations and two 5. titution to obtain one equation and one unknown. he above result and solve for both of the unknowns. on this primer, you may want to review: linear equation 3. Solve for the unknown that remains: b. A+4A=55A=5A=1 4. Substitute this result into either of the original two equations to solve for the other variable: a. 2(1)B=0B=2 Part A - Isolating a Variable Isolating a variable in two equations is easiest when one of them has a coefficient of 1 . Let's say we have the two equations - 3AB=5 - 2A+3B=4 and want to isolate one of the variables, such that it appears by itself on one side of the equation. Which of the following is an equation with one of the above variables isolated? View Available Hint(s) B=3A52A=3B43B=2A4B=53A Part B - Substitution Now that we have one of the variables from Part A isolated, and written in terms of the other variable, we can now substitute this into the other of the two original equations. Which of the following options represents this