Question

If (5,k) is a solution of the equation 2x+y=-7=0, Find the value of k.
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Answer 1

k = -17

Explanation:

Substitute the solution (5, k) into the equation :

• 2x + y = -7 = 0
• 2x + y + 7 = 0
• 2(5) + k + 7 = 0
• 17 + k = 0
• k = -17

Answer 2

k = -3

Explanation:

2x + y - 7 = 0

2x + y + k - 7 = 0

10 + k - 7 = 0

3 + k = 0

k = -3