For the following system, if you isolated x in the second equation to use the substitution method, what expression would you substitute into the first equation?

3x + y = 8
-x - 2y = -10

we will substitute x=10-2 y in the first equation.

Step-by-step explanation:

We are given two equations as:

3 x+y=8

and -x-2 y= -10

to "isolate" means we have to set apart one thing from the others.

here we have to isolate 'x' in the second equation to use the substitution method so we have

x=10-2 y from the second equation.

Hence we will substitute x=10-2 y into the first equation to get the solutions of the given system of equations with the help of substitution method.

area = length x width

length = 2 x width

32 = 2 x width x width

32 = 2 x width^2

36 = width ^2  

width = 6

length = 12

area is 32

perimeter = 2 x 12 + 2 x 6 = 24 + 12 = 36

step-by-step explanation: