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KATRIN_1 [288]
3 years ago
10

Make for me number 21 thx

Mathematics
1 answer:
xz_007 [3.2K]3 years ago
8 0

Method One

You could divide by 5 right away.

20/5 = - 3 + x

4 = - 3 + x Add 3 to both sides.

4 + 3 = x

x = 7

Method Two.

You could remove the brackets. This is slightly longer, but some questions can only be solved that way.

20 = 5(-3) + 5x

20 = -15 + 5x Add 15 to both sides

20 + 15 = 5x

35 = 5x Divide by 5

35/5 = x

7 = x

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3 years ago
24x + 30x = 3x + 24 + 4
Alinara [238K]

24x + 30x = 3x + 24 + 4


54x=3x+24+4


54x=3x+28


54x-3x=28


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7 0
3 years ago
Read 2 more answers
20 POINTS!!!! AND BRAINIEST !!!!
lapo4ka [179]

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3 years ago
Solve the simultaneous equations<br> 2x+y=5<br> 5x+3y=12
Bezzdna [24]

Answer:

x=3 and y= -1

Step-by-step explanation:

Step 1: Solve2x+y=5 for y:

2x+y=5

2x+y+−2x=5+−2x(Add -2x to both sides)

y=−2x+5

Step 2: Substitute−2x+5foryin5x+3y=12:

5x+3y=12

5x+3(−2x+5)=12

−x+15=12(Simplify both sides of the equation)

−x+15+−15=12+−15(Add -15 to both sides)

(Divide both sides by -1)

x=3

Step 3: Substitute3forxiny=−2x+5:

y=−2x+5

y=(−2)(3)+5

y=−1(Simplify both sides of the equation)

Answer:

x=3 and y=−1

5 0
3 years ago
I WILL GIVE BRAINLIEST PLEASE!!! A cereal company is having a special promotion. Every 4 out of 65 boxes contains a coupon for h
ss7ja [257]

Answer:

28

Step-by-step explanation:

4/65 then ?/455

divide 455 by 65 to get 7

4/65=4x7/65x7(455)

4/65=28/455

therefore there are 28 boxes with the coupon out 455

4 0
2 years ago
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