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il63 [147K]
3 years ago
12

HELP!!! Solve the system of equation by graphing : y=x+3 , 2x+y= -6 : also how do you know if it’s substitution or elimination?

Mathematics
2 answers:
Alexxx [7]3 years ago
8 0
It’s substitution you can’t do elimination

schepotkina [342]3 years ago
4 0

Either would work, but substitution looks a bit easier.

The graph for these two is shown below.


I just put the equations in just as they are written. They did not have to be changed in any way. DESMOS is a wonderful program. Very powerful.


The blue line is 2x + y = - 6

The red line is y = x + 3


The best way to solve this other than a graph is to use substitution. Put the red graph into the blue one.

2x + y = - 6

2x +(x + 3) = - 6

2x + x + 3 = - 6

3x + 3 = - 6 Subtract 3 from both sides.

3x = - 6 - 3

3x = - 9

x = -9/3

x = -3


Now go back and solve for y

y = x + 3

y = -3 + 3

y = 0


Answer

The solution point is (-3,0) just what the graph shows.

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Answer: A company saves $134.38 by choosing to make 50 of Box 2 instead of Box 1

Step-by-step explanation:

Hi, to answer this question we have to calculate the surface area of both boxes.

<em>Surface area (A) = 2wl + 2lh + 2hw, </em>

Where w is width, l is length , and h is height.

  • Box 1 = A = 2(6x20) + 2( 20x4) + 2 (4 x 6) =2 (120)+ 2 (80)+ 2(24) =448 in2
  • Box 2 = A = 2 (4x15)+ 2(15x8)+ 2(8x4) = 2(60)+2(120)+2(32)=424 in2

Since 1 inch = 0.0833333 foot

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Since the material used to make a storage box costs $1.25 per square foot.

  • Box 1 =37.34 ft2 x1.25 = $ 46.675
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Since 50 of each are made:

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6 0
2 years ago
Read the question and help me with that, please.​
hram777 [196]

Answer:

B. -1

Step-by-step explanation:

examples:

1 and -1

1/2 and -2

5 0
3 years ago
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