Problem:ย Solve the following system of linear equations by substitution.{8xโ3y=66x+12y=โ24{8๐ฅโ3๐ฆ=66๐ฅ+12๐ฆ=โ24Solution:This one looks a little more complicated than the one we just tried. Remember, with substitution we want to have one variable isolated (by itself), so if there is not one with a coefficient of 1 we'll need to do a little more work.ย There is no variable that has a coefficient of +1 or of โ1 in this system. However, the second equation has coefficients and a constant that are multiples of 6. The second equation will be solved for the variable โx๐ฅโ.6x+12y=โ246๐ฅ+12๐ฆ=โ246x+12yโ12y=โ24โ12y6๐ฅ+12๐ฆโ12๐ฆ=โ24โ12๐ฆ6x=โ24โ12y6๐ฅ=โ24โ12๐ฆ6x6=โ246โ12y66๐ฅ6=โ246โ12๐ฆ6x=โ4โ2y๐ฅ=โ4โ2๐ฆSubstitute (โ4โ2y)(โ4โ2๐ฆ) into the first equation for โx๐ฅโ.8xโ3y=68๐ฅโ3๐ฆ=68(โ4โ2y)โ3y=68(โ4โ2๐ฆ)โ3๐ฆ=6Apply the distributive property and solve the equation.โ32โ16yโ3y=6โ32โ16๐ฆโ3๐ฆ=6โ32โ19y=6โ32โ19๐ฆ=6โ32+32โ19y=6+32โ32+32โ19๐ฆ=6+32โ19y=38โ19๐ฆ=38โ19yโ19=38โ19โ19๐ฆโ19=38โ19y=โ2๐ฆ=โ2Substitute โ2 for y๐ฆ into one of the equations. We can use x=โ4โ2y๐ฅ=โ4โ2๐ฆ since it is one of the original equations in a different form.x=โ4โ2y๐ฅ=โ4โ2๐ฆx=โ4โ2(๐ฅ=โ4โ2( Answer 1 Question 5 ))x=โ4+๐ฅ=โ4+ Answer 2 Question 5x=0๐ฅ=0The solution is (( Answer 3 Question 5 ,, Answer 4 Question 5 )).Check your answer to be sure no errors were made in the calculations.CheckQuestion 5
Question
Problem:ย Solve the following system of linear equations by substitution.{8xโ3y=66x+12y=โ24{8๐ฅโ3๐ฆ=66๐ฅ+12๐ฆ=โ24Solution:This one looks a little more complicated than the one we just tried. Remember, with substitution we want to have one variable isolated (by itself), so if there is not one with a coefficient of 1 we'll need to do a little more work.ย There is no variable that has a coefficient of +1 or of โ1 in this system. However, the second equation has coefficients and a constant that are multiples of 6. The second equation will be solved for the variable โx๐ฅโ.6x+12y=โ246๐ฅ+12๐ฆ=โ246x+12yโ12y=โ24โ12y6๐ฅ+12๐ฆโ12๐ฆ=โ24โ12๐ฆ6x=โ24โ12y6๐ฅ=โ24โ12๐ฆ6x6=โ246โ12y66๐ฅ6=โ246โ12๐ฆ6x=โ4โ2y๐ฅ=โ4โ2๐ฆSubstitute (โ4โ2y)(โ4โ2๐ฆ) into the first equation for โx๐ฅโ.8xโ3y=68๐ฅโ3๐ฆ=68(โ4โ2y)โ3y=68(โ4โ2๐ฆ)โ3๐ฆ=6Apply the distributive property and solve the equation.โ32โ16yโ3y=6โ32โ16๐ฆโ3๐ฆ=6โ32โ19y=6โ32โ19๐ฆ=6โ32+32โ19y=6+32โ32+32โ19๐ฆ=6+32โ19y=38โ19๐ฆ=38โ19yโ19=38โ19โ19๐ฆโ19=38โ19y=โ2๐ฆ=โ2Substitute โ2 for y๐ฆ into one of the equations. We can use x=โ4โ2y๐ฅ=โ4โ2๐ฆ since it is one of the original equations in a different form.x=โ4โ2y๐ฅ=โ4โ2๐ฆx=โ4โ2(๐ฅ=โ4โ2( Answer 1 Question 5 ))x=โ4+๐ฅ=โ4+ Answer 2 Question 5x=0๐ฅ=0The solution is (( Answer 3 Question 5 ,, Answer 4 Question 5 )).Check your answer to be sure no errors were made in the calculations.CheckQuestion 5
Solution
The problem is asking to solve the system of linear equations by substitution. The system of equations is:
8x - 3y = 6 6x + 12y = -24
First, we need to isolate one variable in one of the equations. The second equation is easier to manipulate, so we'll start with that:
6x + 12y = -24 Divide the entire equation by 6 to simplify: x + 2y = -4 Now, x = -4 - 2y
Next, substitute x in the first equation with the value we found:
8(-4 - 2y) - 3y = 6 Simplify the equation: -32 - 16y - 3y = 6 Combine like terms: -32 - 19y = 6 Add 32 to both sides: -19y = 38 Divide by -19: y = -2
Substitute y = -2 into the equation x = -4 - 2y:
x = -4 - 2(-2) x = -4 + 4 x = 0
So, the solution to the system of equations is x = 0 and y = -2.
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Solving Systems of Equations by Substitution
Instructions: Use the substitution method to solve the following system.โ6x+y=19โ6๐ฅ+๐ฆ=194xโ4y=โ164๐ฅโ4๐ฆ=โ16Solution:ย (( Answer 1 Question 7 ,, Answer 2 Question 7 )
Instructions: Solve each system by substitution. Make sure to check your answer BEFORE submitting. State your answer as an ordered pair. DO NOT include spaces in your answer.System 1โ2xโ3y=โ2โ2๐ฅโ3๐ฆ=โ2ย y=2x+14๐ฆ=2๐ฅ+14(( ,, ))System 2โ3xโ3y=9โ3๐ฅโ3๐ฆ=9ย y=4๐ฆ=4(( ,, )
System Linear Equations3.1. Substitution MethodExample: Solve the linear equation in three methodsย ย ย ย ย ย ย ย ย ย ย ย ย 4x + y = 6 -------------โ ย ย ย ย ย ย ย ย ย ย ย ย 5x + 3y = 4 ------------โก
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