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-BARSIC- [3]
3 years ago
15

8х + 4 y = 16 7y = 15 – x

Mathematics
2 answers:
mojhsa [17]3 years ago
7 0

Answer:

x=1      y=2

Step-by-step explanation:

x=1     y=2

8x +4 y=16

8(1) + 4(2)=16

8+8=16

this is correct so now lets check the other one

7y=15-x

7(2)=15-(1)

14=14

this is also correct

olga_2 [115]3 years ago
7 0

Answer: x=1 y=2

Step-by-step explanation:

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Short answer: - 1
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If 2(4x + 3)/(x - 3)(x + 7) = a/x - 3 + b/x + 7, find the values of a and b.
zmey [24]

Answer:

a=3 and b=5.

Step-by-step explanation:

So I believe the problem is this:

\frac{2(4x+3)}{x-3}(x+7)}=\frac{a}{x-3}+\frac{b}{x+7}

where we are asked to find values for a and b such that the equation holds for any x in the equation's domain.

So I'm actually going to get rid of any domain restrictions by multiplying both sides by (x-3)(x+7).

In other words this will clear the fractions.

\frac{2(4x+3)}{x-3}(x+7)}\cdot(x-3)(x+7)=\frac{a}{x-3}\cdot(x-3)(x+7)+\frac{b}{x+7}(x-3)(x+7)

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As you can see there was some cancellation.

I'm going to plug in -7 for x because x+7 becomes 0 then.

2(4\cdot -7+3)=a(-7+7)+b(-7-3)

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Divide both sides by -10:

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Now we have:

2(4x+3)=a(x+7)+b(x-3) with b=5

I notice that x-3 is 0 when x=3. So I'm going to replace x with 3.

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2(12+3)=a(10)+b(0)

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Divide both sides by 10:

\frac{30}{10}=a

3=a

So a=3 and b=5.

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3 years ago
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45+ 1250 + x = 3049<br><br> What is x?
vovangra [49]

Answer:

x is equal to 1754, so it's 1754

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