Which of the following would not be the result of a substitution in the following system? 2x + y = 7 y - x = 1
a) 7 - 2x - x = 1
b) 2x + x + 1 = 7
c) 2(y + 1) + y = 7

Option C.

Step-by-step explanation:

A) The result of the substitution shown in Option A is obtained by solving for y from the first equation and substituting into the second equation:

Therefore, this is a result of a substitution in the given system.

B) The result of the substitution shown in Option B is obtained by solving for y from the second equation and substituting into the first equation:

Therefore, this is a result of a substitution in the given system.

C) The result of the substitution shown in Option C is not  a result of a substitution in the given system, because if you solve for x from the second equation and substitute into the first one, you get:

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign