If a + b = 7 and b=3, what is 4a
A. 20b
B. 17a
C. 16
D.20
2 answers:
Answer:

Step-by-step explanation:
in this Question, you have to plug the value for <u>b </u> into <u>a+</u><u>b=</u><u>7</u><u> </u>in order to find <u>a</u><u>:</u>
- <u>a+</u><u>b=</u><u>7</u>
- <u>a+</u><u>3</u><u>=</u><u>7</u>
- <u>a=</u><u>4</u>
once you know that <u>a=</u><u>4</u><u>,</u><u> </u>just substitute into <u>4</u><u>a</u><u>:</u>
- <u>4</u><u>×</u><u>4</u><u>=</u><u>1</u><u>6</u>
C 16 because a is 4 and 4 times 4 is equal to 16
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