exam Maths Puzzle Numerical Ability

if a[1]=4 and d=-2, what are the first four terms of the arithmetic sequence?

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I need help using the intercpet to graph this equation

x+2y=4 need help on this equation..

5(4-k)= -10k

i tried to do it but not sure.

5(4-k)=-10k
5+5k=-10k
-10k+5k=5
-5=5
k=-1 ?