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Tom [10]
3 years ago
8

Solving by elimination 5x+2y= -3 3x+3y=9 please help me solve x and y

Mathematics
1 answer:
-Dominant- [34]3 years ago
6 0
1) -3(5x+2y=-3)⇒ -15x-6y=9
                                             ⇒ -9x=27
     2(3x+3y=9)⇒ 6x+6y=18

2) -9x/-9=27/-9 ⇒ x=-3 

3) 3(-3)+3y=9⇒ -9+9+3y=9+9⇒ 3y/3=18/3⇒ y=6

Answer: (-3,6)

Reasoning:
Step 1) In order to eliminate, first I had to multiple the first equation by -3 and the second by 2 so that when combining the equations y would cancel each other out so that I could solve for x. <em>Note: There are many combinations as to how you could multiple the equations so that either the x or y would cancel out.
</em>
Step 2) Once y is eliminated, solve for x.

Step 3) Now plug x back into one of the original equations and solve for y. <em>Note: Plug x back into one of the original equations, not the equations that were changed by multiplication,</em> 

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2 years ago
A graph titled Cost of a Lunch in a School's Cafeteria has Days since school started on the x-axis and cost of lunch (dollars) o
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1 year ago
WILL GIVE BRAINLIEST!!!!!!!!!!!!!! Select the points that are solutions to the system of inequalities. Select all that apply
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Hello there!

the solutions to this system of inequalities are every point in the blue area. In order to figure out if each of those choices are solutions, just graph the points, and if they are in the blue, they are solutions.

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Please answer ASAP!
iren [92.7K]
Maybe, 150-100=50 on each triangular side. 50*height(80)=4000 divided by 2=2000. 2000 *'s 2, since we have to count the other side. Now, we have 100 left. so top of rectangle,(48 ft) times what's left of height. 48*(80-64=16) 16=768. Which covers the width of the big column, (48) and leftover height. Next, we find out the 2 left columns, one on each side of rectangle. Find area of rectangle, (what's left) 100. 100*80=800. 800- area of rectangle. Area of rectangle= 3072. Almost lastly, 4000 plus 800= 4800, then, 4800-3072=1728. I believe that the correct answer for the area of the lawn is 1,728 feet.
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3 years ago
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