Answer:
26.25 = x
Explanation:
f ( x ) = 4x - 5
f ( x ) = Y-value
x = x - value
If f ( 100 ) = The Y is 100
100 = 4x - 5
+5 = +5 Add 5 on both sides. The 5's will cancel on the right
-------------------
105 = 4x Divide by 4 on both sides. The 4's will cancel on the right
----- = ----
4 = 4
26.25 = x
Hope this helps!!