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Alexxx [7]
3 years ago
13

What is solution 7x+5y=-24 and 4x+y=42?

Mathematics
2 answers:
LenKa [72]3 years ago
6 0
7x+5y=-24 (1)
   4x+y=42 (2)

multiply equation (2) by 5 to get
20x+5y=210 (3)

then calculate (3)-(2) which gives you
13x=234 hence x=18
then substitute for x in either equation to get y=-30
iren [92.7K]3 years ago
5 0
{ 7x + 5y = - 24
{ 4x + y = 42    ⇒  y = 42 - 4x

7x + 5y = - 24
7x + 5.( 42 - 4x ) = - 24
7x + 210 - 20x = - 24
7x - 20x = - 24 - 210
- 13x = - 234 .(-1)
  13x = 234
   x = <u>234</u>
          13
   x = 18

4x + y = 42
4.(18) + y = 42
72 + y = 42
y = 42 - 72
y = - 30

S = { 18 , - 30 }
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Madi has $8.80 in pennies and nickels.
shepuryov [24]
Let p = number of pennies.
Let n = number of nickels.

We are given that n= 2p and the total value is $8.80.

We know that a penny = $0.01 and that a nickel = $0.05.

So $0.01p + $0.05n = $8.80.

Substitute 2p for n:
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3 years ago
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What are the vertical asymptote(s) of y= (x-6)/(x+8) (x-7)
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Answer:

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Step-by-step explanation:

recall that for a rational expression, the vertical asymptotes occur at x-values that causes the expression to become undefined. These occur when the denominator becomes zero.

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3 years ago
Read 2 more answers
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