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2 years ago

How to work -1x-2y=-13 x-2y=11 equation by substitution

1 answer:

5 0

Well if you're wanting to use substitution, you first have to end up with one term on either side of the equation. Use the second one as it's easiest.

So: x-2y=11, so find -2y as there is a -2y in the first equation.
then that becomes -2y=11-x. then sub that into equation 1, and you get:

-x+11-x=-13, which equals to -2x+11=-13, which is -2x=-24, so therefore

x=12. then chuck the x into any of the equations to find what y equals.

hope this helps!

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LAST OF MY GEOMETRY PLZ HELP

makvit [3.9K]

Answer:

Step-by-step explanation:

14) 2x - 10 = 80 {alternate interior angles are equal}

2x = 80 + 10

2x = 90

x = 90/2

x = 45°

15) 3x + 120 = 180 { co interior angles are supplementary}

3x = 180 - 120

3x = 60

x = 60/3

x = 20°

16) 3x + 15 = 135 {corresponding angles are equal}

3x = 165 - 15

3x = 150

x = 150/3

x = 50°

4 0

2 years ago

Which expression is the factorization of x2 + 10x + 21?

LiRa [457]

<h2>Solution:</h2>

Equation: x² + 10x + 21

Step 1: Find two numbers that can add up to 10 and be multiplied to 21. We have: 7 & 3, in the sense that 7+3=10, and 7×3=21. Replacing 10 with 7+3, the equation is now → x² + 7x + 3x + 21

Step 2: Get the new equation bracketed → (x² + 7x) (+3x + 21)

Step 3: Use 'x' in the equation. For the first part, we have 'x'. x² = x × x so, bring out one x out side the bracket, divide 7x by = 7 → x (x +7). Do the same for the second part by dividing 21 by 3 = 7, and then bringing out 3 from the bracket → 3 (x + 7).

Bringing everything together, we have: x(x+7) +3(x+7) → (x+3) (x+7)

<h3>Final answer:</h3>

(x+3) (x+7)

<h3 />

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1 year ago

What is the slope and y-intercept of the graph? (write your answer in simplest form)

Basile [38]

Answer:

Step-by-step explanation:

what do u mean by the simplest form?

8 0

2 years ago

A store has a 20% off sale. Which equation

rodikova [14]

Answer:

80%/100%×$24

Step-by-step explanation:

I don't see any options here so let's work it out.

If all prices are reduced by 20%,it implies that 80% of the original value is charged to the buyer as sales price.

Since original value of the pants is $24-100%

then sales value(80%)=(80%/100%×$24)

5 0

2 years ago

Read 2 more answers

Please give me a real answer or I will report you I dont want to friend you just put the answers in the comments

kotykmax [81]

Answer:

j = 17.32 sq rt 3 or 30

Step-by-step explanation:

sin 60 = j/20sq rt 3

0.8660 = j/20sq rt 3

j = 17.32 sq rt 3

4 0

2 years ago