I don't know if this is how i'm supposed to explain it, but AC is twice the size of DF, and DF is twice the size of CF
Pretend that DF is 2 inches, then AC is 4 inches and CF is 1 inch, so you get this:
Answer:
x=46 4/5, x=46.8
Step-by-step explanation:
To find x-intercept/zero, substitute y=0
-222=5x-3(-7*0-4)
-222=5x-3(-7*-4) Solve
x= -234/5
x=46 4/5, x=46.8
Multiply each row in the first matrix by each column in the second matrix:
1*2 + 3*3 + 1*4 1*-2 + 3*5 + 1*1
-2*2 + 1*3 + 0*4 -2*-2 + 1.5 + 0*1
Simplify to get
[15 14
-1 9]
The third choice is the correct answer.