Answer:
2/7x + 8/7
Step-by-step explanation:
f(x) = -4 + 7/2x
y = -4+7/2x
Exchange x and y
x = -4 +7/2y
Solve for y
Add 4 to each side
x+4 = -4+4 +7/2y
x+4 = 7/2y
Multiply each side by 2/7
2/7(x+4) = 2/7 * 7/2y
2/7(x+4) = y
2/7x + 8/7
Answer is 16
8 (6 1/4 x 3.2 - 18)
8 ( 6x4+1) = 25/4
8 (25/4 x 3.2 - 18)
8 (25/4 x 3.2) = 80/4 = 20
8 (20 - 18) = 2
8 x 2 = 16
Assuming you are solving for x
do the opposite of PEMDAS. Isolate the x. Because of equal sign, what you do to one side, you do to the other.
x/5 + 9 = 4
x/5 + 9 (-9) = 4 (-9)
x/5 = 4 - 9
x/5 = -5
x/5(5) = -5(5)
x = -5(5)
x = -25
-25 is your answer for x
hope this helps
