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andreev551 [17]
4 years ago
14

Can someone please help me with this .

Mathematics
2 answers:
schepotkina [342]4 years ago
8 0
- 3x + 4y = - 11
y = 2x - 4

-3x + 4(2x - 4) = -11
-3x + 8x - 16 = - 11
5x = -11 + 16
5x = 5
x = 5/5
x = 1

y = 2x - 4
y = 2(1) - 4
y = 2 - 4
y = -2

Solution: (1, -2)
pav-90 [236]4 years ago
4 0

Let's go ma dude,

-3x + 4y = -11

y = 2x - 4

We know that y = 2x - 4 so we plug it into the first equation:

-3x + 4(2x - 4) = -11

-3x + 8x - 16 = -11

5x - 16 = -11

5x = 5

x = 1

Now we know that x = 1 so we plug it into the first/ second equation:

-3(1) + 4y = -11

-3 + 4y = -11

4y = -8

y = -2


And walla ur answer is reddy!

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A local bake shop sells cookies and cakes.On monday , sean bought 3 cookies and 5 cakes and spent $78.75 on tuesday , sean bough
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Answer:

The price of one cookie is $1.25 and the price of one cake is $15.

Step-by-step explanation:

Let $x be the price of one cookie and $y be the price of one cake.

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3x+5y=78.75.

2. On Tuesday, Sean bought 8 cookies and 2 cakes, then he spent $(8x+2y) and this is $40. Thus,

8x+2y=40.

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\left\{\begin{array}{l}3x+5y=78.75\\8x+2y=40\end{array}\right.

Multiply the first equation by 2 and the second equation by 5 and subtract them:

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