Question

Check whether 21q+18 is of the form 7q+4 for some integer q.​

Answer 1

Answer:

Step-by-step explanation:

build up the equation below

21q + 18 = 7q + 4

21q - 7q +18 = 7q -7q + 4

14q +18     = 4

14q +18- 18  = 4-18

14q   = -14

q   = -1

since there is a solution for the equation , there is a number such that 21q+18 = 7q+4

Answer 2

Answer:

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