What is the solution to the system of equations? use the substitution meathod to solve. 6=-4x+y and -5x-y=21

(-3,-6)

Step-by-step explanation:

A system of equations is 2 or more equations for which the same x,y solution exists. We can solve the system in three ways: elimination, substitution, or graphing. Substitution can be used by substituting the value of one variable into the equation.

We can solve for y in 6=-4x+y. 6+4x=y.

Because y=6+4x, we can substitute 6+4x into y in -5x-y=21.

-5x-y=21

-5x-(6+4x)=21

-5x-6-4x=21

-9x-6=21

-9x=27

x=-3

We now substitute x=-3 into y=6+4x.

y=6+4x

y=6+4(-3)

y=6-12

y=-6

answer: asdfghjkl,mnbv

step-by-step explanation:

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )