Question

if x=5 and y=3 is a solution of 3x + ky =3 find k.

Answer 1

3×5 + k×3 = 3
15+3k=3
3k=3-15
k=-12/3
k=-4

Answer 2

x = 5 y = 3

3x + ky = 3

3 × 5 + k × 3 = 3
15 + 3 k = 3
15 - 3 = - 3k
12 = - 3k
k = 12 ÷ ( - 3)
k = - 4


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