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Mathematics

1 answer:

GREYUIT [131]3 years ago

3 0

Step-by-step explanation:

above is the solution to the question

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Which statement correctly explains how Dana can solve the following system of linear equations for x using the elimination metho

Vanyuwa [196]

1. The correct statement is the first one, which is: Add the two equations, solve for y, and then substitute –1 for y to find x.

2. Therefore, you have the following system of equations:

4x+8y=20
-4x+2y= -30

3. When you add the two equations, and clear the variable "y", you obtain:

10y=-10
y=-1

4. Now, you must substitute -1 for y (y=-1) to find x, as below:

4x+8y=20
4x+8(-1)=20
4x-8=20
4x=20+8
4x=28
x=28/4
x=7

6 0

4 years ago

Read 2 more answers

1. Hoover Dam spans the Colorado

Alona [7]

BEST estimate of this amount is $2(10^{7})$ . Correct option A. 2 x 10^7 .

Step-by-step explanation:

Here we have , Hoover Dam spans the Colorado River on the Nevada-Arizona state line. For its construction, the federal government purchased 21,670,000 pounds of gates and valves. We need to find BEST estimate of this amount . Let's find out:

21,670,000 pounds

⇒ 21,670,000 pounds

⇒ $21,670,000$