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likoan [24]
3 years ago
13

Tell which equation you would use to isolate a variable in order to solve the system using substitution. Explain your reasoning.

Mathematics
1 answer:
vampirchik [111]3 years ago
3 0
2x+y=-10
Multiply both side by 3
2x*3+y*3=-10*3
6x+3y=-30

3x-y=0
Multiply both side by 2
3x*2-y*2=0*2
6x-2y=0
Next, use substitute property
6x+3y=-30
    -
6x-2y=0
    =
y=-30
3x-y=0
Substitute y with -30
3x-30=0
Add 30 to each side
3x-30+30=0+30
3x=30
Divided both side by 3
3x/3=30/3
x=10, so the solution pair is (10,-30). In this case, there is the first way to solve these two equation.
Then, I would use equation 3x+1.5y=-15 in this question by multiply 2x+y=-10 by multiplying both side by 3/2 to eliminate x and to solve variables for y. Hope it help!
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Is there a greatest positive integer? If so, what is it? If not, why not?
balu736 [363]
No, there is no 'greatest integer'. That is because positive numbers can go up tp infinite, and we do not know where numbers stop. 

However, there is a negative greatest integer because the ones that's closes to zero is -1. 
3 0
3 years ago
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Smallville High School scored more than 30 points in their last football game entirely from safeties and field goals. (In
Reika [66]

Inequalities help us to compare two unequal expressions. The inequality for this scenario in standard form is 2x + 3y > 30.

<h3>What are inequalities?</h3>

Inequalities help us to compare two unequal expressions. Also, it helps us to compare the non-equal expressions so that an equation can be formed.

It is mostly denoted by the symbol <, >, ≤, and ≥.

Let the safety counts be represented by x, while the field goal count is represented by y.

Part A: The inequality for this scenario in standard form.

2x + 3y > 30

Part B: The inequality in slope-intercept form.

2x + 3y > 30

3y > 30 - 2x

y > 10 - (2/3)x

y < (2/3)x - 10

PartC: The inequality is represented below.

Learn more about Inequality:

brainly.com/question/19491153

#SPJ1

7 0
2 years ago
What ratio is equivalent to 4:5 A. 10/15 B. 4/10 C. 16/20 D. 15/8
laila [671]

The answer is C 16:20 because both numbers 4&5 are multiplied by four

8 0
3 years ago
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Please help me!!!!!​
a_sh-v [17]

Answer:

A

Step-by-step explanation:

Since f(x) is graphed, you need to look at the specified intervals and see which of them have the entire portion graphed below the x axis.

3 0
3 years ago
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Need help ASAP. Please and thanks!:
Nuetrik [128]

Answer:

The answer is x=294 (B)

Step-by-step explanation:

Remember, all interior angles of a hexagon add to 720.

So add all the  given numbers first.

92+100+94+140+x= 720

426+x=720

-426 from both sides

x= 294

I know this is a week later since you posted the question, sorry.

3 0
2 years ago
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