Question

Solve the equation for y.
5x – 4y = 12
A. y = -5/4x - 3
B. y = 4/5x + 3 
C. y = 5/4x - 3
D. y = -4/5x + 3 

Answer 1

The idea is to isolate y. So you need to subtract 5x from both sides. Then you need to divide both sides by -4 to completely isolate y

5x – 4y = 12

-4y = 12 - 5x

-4y = -5x + 12

y = (-5x + 12)/(-4)

y = (-5x)/(-4) + (12)/(-4)

y = 5/4x - 3

Answer 2

Graph the relation in the table. Then use the vertical-line test. Is the relation a function?

x
y
–1
3
1
–1
2
2
1
3

A.
The relation is a function.

B.
The relation is not a function.

C.
The relation is a function.

D.
The relation is not a function.