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Problem:ย Solve the following system of linear equations by substitution.{8xโˆ’3y=66x+12y=โˆ’24{8๐‘ฅโˆ’3๐‘ฆ=66๐‘ฅ+12๐‘ฆ=โˆ’24Solution: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 โ€“1 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 โ€˜x๐‘ฅโ€™.6x+12y=โˆ’246๐‘ฅ+12๐‘ฆ=โˆ’246x+12yโˆ’12y=โˆ’24โˆ’12y6๐‘ฅ+12๐‘ฆโˆ’12๐‘ฆ=โˆ’24โˆ’12๐‘ฆ6x=โˆ’24โˆ’12y6๐‘ฅ=โˆ’24โˆ’12๐‘ฆ6x6=โˆ’246โˆ’12y66๐‘ฅ6=โˆ’246โˆ’12๐‘ฆ6x=โˆ’4โˆ’2y๐‘ฅ=โˆ’4โˆ’2๐‘ฆSubstitute (โˆ’4โˆ’2y)(โˆ’4โˆ’2๐‘ฆ) into the first equation for โ€˜x๐‘ฅโ€™.8xโˆ’3y=68๐‘ฅโˆ’3๐‘ฆ=68(โˆ’4โˆ’2y)โˆ’3y=68(โˆ’4โˆ’2๐‘ฆ)โˆ’3๐‘ฆ=6Apply the distributive property and solve the equation.โˆ’32โˆ’16yโˆ’3y=6โˆ’32โˆ’16๐‘ฆโˆ’3๐‘ฆ=6โˆ’32โˆ’19y=6โˆ’32โˆ’19๐‘ฆ=6โˆ’32+32โˆ’19y=6+32โˆ’32+32โˆ’19๐‘ฆ=6+32โˆ’19y=38โˆ’19๐‘ฆ=38โˆ’19yโˆ’19=38โˆ’19โˆ’19๐‘ฆโˆ’19=38โˆ’19y=โˆ’2๐‘ฆ=โˆ’2Substitute โ€“2 for y๐‘ฆ into one of the equations. We can use x=โˆ’4โˆ’2y๐‘ฅ=โˆ’4โˆ’2๐‘ฆ since it is one of the original equations in a different form.x=โˆ’4โˆ’2y๐‘ฅ=โˆ’4โˆ’2๐‘ฆx=โˆ’4โˆ’2(๐‘ฅ=โˆ’4โˆ’2( Answer 1 Question 5 ))x=โˆ’4+๐‘ฅ=โˆ’4+ Answer 2 Question 5x=0๐‘ฅ=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.{8xโˆ’3y=66x+12y=โˆ’24{8๐‘ฅโˆ’3๐‘ฆ=66๐‘ฅ+12๐‘ฆ=โˆ’24Solution: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 โ€“1 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 โ€˜x๐‘ฅโ€™.6x+12y=โˆ’246๐‘ฅ+12๐‘ฆ=โˆ’246x+12yโˆ’12y=โˆ’24โˆ’12y6๐‘ฅ+12๐‘ฆโˆ’12๐‘ฆ=โˆ’24โˆ’12๐‘ฆ6x=โˆ’24โˆ’12y6๐‘ฅ=โˆ’24โˆ’12๐‘ฆ6x6=โˆ’246โˆ’12y66๐‘ฅ6=โˆ’246โˆ’12๐‘ฆ6x=โˆ’4โˆ’2y๐‘ฅ=โˆ’4โˆ’2๐‘ฆSubstitute (โˆ’4โˆ’2y)(โˆ’4โˆ’2๐‘ฆ) into the first equation for โ€˜x๐‘ฅโ€™.8xโˆ’3y=68๐‘ฅโˆ’3๐‘ฆ=68(โˆ’4โˆ’2y)โˆ’3y=68(โˆ’4โˆ’2๐‘ฆ)โˆ’3๐‘ฆ=6Apply the distributive property and solve the equation.โˆ’32โˆ’16yโˆ’3y=6โˆ’32โˆ’16๐‘ฆโˆ’3๐‘ฆ=6โˆ’32โˆ’19y=6โˆ’32โˆ’19๐‘ฆ=6โˆ’32+32โˆ’19y=6+32โˆ’32+32โˆ’19๐‘ฆ=6+32โˆ’19y=38โˆ’19๐‘ฆ=38โˆ’19yโˆ’19=38โˆ’19โˆ’19๐‘ฆโˆ’19=38โˆ’19y=โˆ’2๐‘ฆ=โˆ’2Substitute โ€“2 for y๐‘ฆ into one of the equations. We can use x=โˆ’4โˆ’2y๐‘ฅ=โˆ’4โˆ’2๐‘ฆ since it is one of the original equations in a different form.x=โˆ’4โˆ’2y๐‘ฅ=โˆ’4โˆ’2๐‘ฆx=โˆ’4โˆ’2(๐‘ฅ=โˆ’4โˆ’2( Answer 1 Question 5 ))x=โˆ’4+๐‘ฅ=โˆ’4+ Answer 2 Question 5x=0๐‘ฅ=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

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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.

This problem has been solved

Similar Questions

Solve the system by substitution.x, equals, minus, 6, yx=โˆ’6y4, x, plus, 10, y, equals, 144x+10y=14

Solving Systems of Equations by Substitution

Instructions: Use the substitution method to solve the following system.โˆ’6x+y=19โˆ’6๐‘ฅ+๐‘ฆ=194xโˆ’4y=โˆ’164๐‘ฅโˆ’4๐‘ฆ=โˆ’16Solution: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 1โˆ’2xโˆ’3y=โˆ’2โˆ’2๐‘ฅโˆ’3๐‘ฆ=โˆ’2ย y=2x+14๐‘ฆ=2๐‘ฅ+14(( ,, ))System 2โˆ’3xโˆ’3y=9โˆ’3๐‘ฅโˆ’3๐‘ฆ=9ย y=4๐‘ฆ=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 ------------โ‘ก

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