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4 years ago

5x+y=2 2x3y=62 whatn is x and y

2 answers:

5 0

Ok sure!
first we have to find y

so...
lets start with the first one:

5x+y=2 (we cannot have two variables together so:
5x+y=2
-y =-y so.. now we have 5x= 2-y (but we must get y positive and by itself!)
-2 = -2
so: now you have
5x-2=-y but need a positive variable so multiply each side by a (-1)
(-1) 5x-2=-y (-1) So..
-5x +2 =y so now we know Y!
therefore whenever you see why in the next problem insert in its place: -5x +2

I hope it helps!! :)

guapka [62]4 years ago

5 0

5x + y = 2 ⇒ 10x + 5y = 4
2x + 3y = 62 ⇒ 10x + 15y = 310
 -10y = -306
 -10 -10
 y = -30.6
 5x - 30.6 = 2
 +30.6 +30.6
 5x = 32.6
 5 5
 x = 6.52
 (x, y) = (6.52, -30.6)

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Read 2 more answers

Solve 2 1/2 divided by 5 1/3 = 8/x

ipn [44]

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We're dividing fractions, so we will flip the one in the denominator upside down and we will multiply it with the numerator.

$\frac { \frac { 5 }{ 2 } }{ \frac { 16 }{ 3 } } \quad =\quad \frac { 5 }{ 2 } \cdot \frac { 3 }{ 16 } =\frac { 5\cdot 3 }{ 2\cdot 16 } =\frac { 15 }{ 32 }$

Let's equal this too 8/x

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Cross multiply.

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Check the explanation

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