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3 years ago

Solve the system using elimination. 3x – y = 28 3x + y = 14

Mathematics

2 answers:

leonid [27]3 years ago

5 0

Answer:

Step-by-step explanation:

Let 3x-y=28-----------(1)

Let 3x+y =14-----------(2)

(2)-(1)

3x-3x + y-(-y) =14-28

2y=-14

y=-14/2= -7

By adding 1 and 2

3x+3x+(-y)+(y) = 28+14

6x = 42

X=42/7=6

Vikki [24]3 years ago

4 0

Answer:

x= 7, y= -7 or (7, -7)

Step-by-step explanation:

3x-y=28

3x+y=14

because the y is opposite of each other in both equations you can cancel them out

3x=28

3x=14

next you add 3x to 3x, then 28 to 14 and get...

6x=42

next divide both sides by 6 and you get your answer for x...

x=7

now you must solve for y and you do this by substituting what you found for x in one equation it doesn't matter which because you'll get the same answer but you can check for both to make sure...

3(7)+y=14

21+y=14

y=-21+14

y=-7

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Find each product mentally using the Distributive Property. Show the steps that you used. For 6x13 in distributive property

aivan3 [116]

Using Distributive Property, the product of 6x13 is 78.

<h3>What is Distributive property?</h3>

The distributive property states that multiplying the sum of two or more addends by a number yields the same outcome as multiplying each addend separately by the number and combining the resulting products.

The steps of distributive property are -

6 × 13

6 × (10 + 3)

(6 × 10) + (6 × 3)

((3 + 3) × (5 +5)) + ((3 + 3) × 3)

(3 × 5 + 3 × 5 + 3 × 5 + 3 × 5 ) + ((3 × 3) + (3 × 3))

(15 + 15 +15 + 15 ) + (9 + 9)

60 + 18

= 78

To learn more about distributive property from given link

brainly.com/question/2807928

#SPJ4