Elimination is easiest if one of the coefficients of a variable is a multiple of the other coefficient of the variable. Here, we have x-coefficients of 4 and 8, so it will be easiest to eliminate x.

Subtract the second equation from 2 times the first.

2(4x +7y) -(8x +5y) = 2(-14) -(8)

9y = -36 . . . . . simplify

y = -4 . . . . . . . divide by 9

4x +7(-4) = -14 . . . . substitute for y in the first equation

4x = 14 . . . . . . . add 28

x = 3.5 . . . . divide by 4

The solution is (x, y) = (3.5, -4).

4 0

2 years ago

Between 02 30 and 05 15, the same day ,the volume of water in a reservoir increased from 1500 L to 14 700 L. What was the averag

marishachu [46]

Answer:

4,800

Step-by-step explanation:

(14,700- 1,500) / 2 h 45 m

= 13,200 / 2.75

= 4,800 L/h

6 0

2 years ago

Read 2 more answers

How do i know when a set of ordered pairs that represents a function?

pav-90 [236]

Answer:

How do you figure out if a relation is a function? You could set up the relation as a table of ordered pairs. Then, test to see if each element in the domain is matched with exactly one element in the range. If so, you have a function!

Step-by-step explanation:

5 0

3 years ago