De=4x+10, ef=2x-1, and df=9x-15, find df

DE and EF are segments of the line DF, so they will add up to DF. This can be represented with this equation:

Combine like terms:

Add 15 to both sides:

Subtract 6x from both sides:

Divide both sides by 3 to get x by itself:

The value of x will be 8.

Plug this value of x into the expression for DF:

DF will equal 57.

correct answer is infinitely many solutions

step-by-step explanation:

2(2x + 3) = -4 + 2(2x + 5)

solving the above equation:

4x + 6 = -4 +4x +10

combining like terms

4x -4x = -4+10-6

0=0

since both sides are 0=0, we end up into true statement it means it has infinite many solutions.

so correct answer is infinitely many solutions

lockers 1, 4, 9, 16, 25, 40, and 49 are open

i ran through it by the other answer is wrong