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laila [671]
3 years ago
13

Y-3x=2 y=-2x-8 how do i solve this by substitution

Mathematics
2 answers:
11111nata11111 [884]3 years ago
3 0
\left \{ {{y-3x=2} \atop {y=-2x-8}} \right. \\\\Substitute\ second\ equation
 to\ first:\\\\-2x-8-3x=2\\-2x-3x=2+8\\-5x=10\ \ \ \ \ \ |:-5\\x=-2\\\\y=-2\cdot(-2)-8\\y=4-8\\y=-4\\\\ \left \{ {{y=-4} \atop {x=-2}} \right.
kupik [55]3 years ago
3 0
Y-3x=2
y=-2x-8
-2x-8-3x=2
-5x-8=2 add 8 from both side
-5x=10 divided -5 both side
x=-2
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Describe the steps you would take to solve for the variable x in the following
adoni [48]

Answer:

x =  19

Step-by-step explanation:

1. add 31 on both sides (you wanna get the "x" by itself)

ex: 2x - 31 = 7

          +31   +31

2. the 31s cancel each other out so now you add 31 + 7

2x       =  7

           +31

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             38

3. divide 2 on both sides so the 2s cancel each other out and only the x is left

ex: 2x / 2 = x         38 ( the 38 stands alone)

4. now divide 38/2 and you have your answer

X= 19

5 0
3 years ago
if you add the digits in a two-digit number and multiply the sum by 7, you get the original number. If you reverse the digits in
ANTONII [103]
Let m the tens digit and n the ones
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7(m+n) =10m+n
7m+7n=10m+n
6n=3m

Reversing the number 10n+m
10n+m=18+n+m
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6n=3m
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the number is 10m+n=10(4)+2=42
4 0
3 years ago
Please some help me it’s due at 11:59
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6 0
3 years ago
Is 3 x 1/2 greater than 5?
Kryger [21]
No it is not greater than 5

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And 1.5 is not greater than 5

So the answer is no



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3 years ago
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5 years is 60 months.

A₆₀ = 18 000(1 + 0.0025)⁶⁰ = $20 909.1021  ≈ $20 909.10
8 0
3 years ago
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