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Trava [24]
2 years ago
13

Can someone solve a - 3 over 7 s = -8 and a + 24 = -15 STEP BY STEP PLEASE.

Mathematics
2 answers:
Ainat [17]2 years ago
8 0

Answer:

a=-39; s=0.75

Step-by-step explanation:

Solve the System of Equations by Substitution.

First, solve one of the equations for a variable. I'll do the 2nd one because it only has one variable.

a+24=-15 -------> a=-39

Now we know what a is just plug it back into the other equation and get s.

\frac{a-3}{7s} =-8

\frac{-39-3}{7s} =-8

\frac{-42}{7s} =-8

Switch the -8 and 7s

\frac{-42}{-8} =7s

Simplify the fraction

5.25=7s

Divide by 7 to isolate the s

0.75=s

 

TiliK225 [7]2 years ago
6 0

Answer:

2)a+24=-15

a=-15-24

a=-39

Step-by-step explanation:

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algol13

Answer:

In February, 423 daytime minutes is used

Step-by-step explanation:

Let the base plan charges be x

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In December,

x  + 510y =  92.25------------------(1)

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x + 397y = 77.56---------------------(2)

Subtracting eq(2) from eq(1)

x  + 510y =  92.25

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-------------------------------

0  + 113y = 14.69

-------------------------------

y = \frac{14.69}{113}

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x = 92.25 - 66.3

x = 25.95

So In February

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25.95 + (daytime minute)(0.13) = 80.9

(daytime minute)(0.13) = 80.9 - 25.95

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