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Annette [7]
2 years ago
12

15= 3-4a what is the value of a in the equation

Mathematics
2 answers:
balu736 [363]2 years ago
8 0
Step 1)

15 = 3-4a
15 =3+-4a
15 = -4a + 3

Step 2)

-4a + 3 = 15

Step 3)
-4a + - 3 = 15 - 3
-4a = 12

Step 4)

-4a/-4a = 12/-4

a = 3

Answer is a=3

anzhelika [568]2 years ago
6 0

Answer:

5

Step-by-step explanation:

when 13 is subtracted from 5 we get 8

again when 8=2m

8/2=m

4=m

.

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2 years ago
Solve for the indicated variable. Include all of your work in your answer. Submit your solution. P = 3r + 2s; for s.
madam [21]
<h3>Given</h3>

P = 3r + 2s

<h3>Find</h3>

the corresponding equation for s

<h3>Solution</h3>

First of all, look at how this is evaluated in terms of what happens to a value for s.

  1. s is multiplied by 2
  2. 3r is added to that product

To solve for s, you undo these operations in reverse order. The "undo" for addition is adding the opposite. The "undo" for multiplication is division (or multiplication by the reciprocal).

... P = 3r + 2s . . . . . . starting equation

... P - 3r = 2s . . . . . . -3r is added to both sides to undo addition of 3r

... (P -3r)/2 = s . . . . . both sides are divided by 2 to undo the multiplication

Note that the division is of everything on both sides of the equation. That is why we need to add parentheses around the expression that was on the left—so the whole thing gets divided by 2.

Your solution is ...

... s = (P - 3r)/2

3 0
3 years ago
Let A = Andrea's age, Find expressions for the following
Shalnov [3]

Answer:

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Step-by-step explanation:

Turn the words into an algebraic expressions. so Andrea's (b)  is (=) two years less (-2) than (flips the expression so place this first ->) twice (times 2) her age (a) So b = 2a -2

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