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3 years ago

14

Evaluate 8d - 10 for d = 4

2 answers:

cluponka [151]3 years ago

6 0

If you want to evaluate 8*d - 10 and you know the value of the d (in this case it is 4), you just have to insert the number 4 instead of the d.

So, 8*d - 10 equals to 8*4 -10. Now, you have to multiply 8 and 4 and you get 32. In the last step you have to subtract 10 from 32; 32 - 10 = 22.

The correct result is 22.

Rufina [12.5K]3 years ago

4 0

Just plug it in.

8(4) - 10
32 - 10
22

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3 years ago

9. 3x + 9y = 18<br> y = x + 2<br> Substitution method

777dan777 [17]

Answer:

x = 0

y = 2

Step-by-step explanation:

3x + 9y = 18 ---------eqn 1

y = x + 2---------eqn 2

Substitute eqn 2 into eqn 1, for the value of y

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Hint: to confirm the values

x = 0

y = 2

Let's take eqn 1 ,

3x + 9y = 18

3(0) + 9(2)

= 0 + 18

= 18

Correct

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Collect like terms

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