3 years ago

9. If DF = 42, find DE.7x+1 4x-3DEF what is DE

Mathematics

1 answer:

andreev551 [17]3 years ago

3 0

Answer:

Step-by-step explanation:

So DF = 42, And we know that DF = DE + EF

Therefore (7x+1) + (4x-3) = 42

11x -2 = 42

11x = 44

x = 4

Substitute x = 4 onto DE equation, so 7(4) +1

= 29.

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9. If DF = 42, find DE.7x+1 4x-3DEF what is DE​

9. If DF = 42, find DE.7x+1 4x-3DEF what is DE