16-10-2019
Mathematics

contestada

За + 4a = -21 Solve the problem

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Sarah0404 Sarah0404

16-10-2019

Answer:

a = -3

Step-by-step explanation:

3a + 4a = -21

3a + 4a = 7a

7a = -21 Divide both side with 7

-21 / 7 = -3

a = -3

To make it true...

3(-3) + 4(-3) =

-9 + (-12) = -21

-21 = -21

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