Unit 2
1. In the following equations, the value of x
represents the price per pound of gravel and the
value of y represents the price per pound of
sand.
2y = 3x + 8
5y - 15x = -30
At what price for sand do the two lines
intersect?
A. $6.67
B.
$10.00
C. $12.33
D. $14.00

Respuesta :

Answer:

A. $6.67

Step-by-step explanation:

a) 2y -3x + 8

a) y = - 3/2x + 8/2

a) y = - 3/2x + 4

b) 5y - 15x = -30

b) 5y = 15x - 30

b) y = 15/5x - 30/5

b) y = 3x - 6

3x - 6 = 3/2x + 4

3x -3/2x = 4+6

3/2x = 10

x = (10) / (3/2) = $6.67