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Sliva [168]
3 years ago
13

6a - 5b when a = -3 and b = 4

Mathematics
2 answers:
DIA [1.3K]3 years ago
8 0

Given.

6a - 5b

Plug in values.

6(-3) - 5(4) =

-18 - 20 =

-38

AURORKA [14]3 years ago
6 0

For this case we have the following expression:

6a-5b

We must evaluate the expression when:

a = -3\\b = 4

Then, replacing the values we have:6 (-3) -5 (4)

Taking into account that according to the law of the signs of multiplication, it is fulfilled that:

+ * - = -

So:

-18-20 =

Equal signs are added and the same sign is placed:

-38

Answer:

-38

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Three fourths a number plus 8 is 20 less than the number
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Answer:

Equation:  \frac{3}{4}n+8=n-20

Solve for n:  n = 112

Step-by-step explanation:

To first set up the equation, you need to look at the verbal description and translate into numbers and operations:

'three fourths a number' =  \frac{3}{4} n

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Put the expressions together:

'three fourths a number plus 8':  \frac{3}{4}n+8

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Set them equal to each other and solve: \frac{3}{4}n+8=n-20

Add 20 to both sides: \frac{3}{4}n+8+20=n-20+20

Subtract \frac{3}{4}n from both sides: \frac{3}{4}n-\frac{3}{4}n+28=n-\frac{3}{4}n

Multiply both sides by \frac{4}{1}: \frac{4}{1}28=\frac{1}{4}n\frac{4}{1}

Solve for n:  n = 112

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Step-by-step explanation:

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