Question

x + y = 3k
x - y = k

The solution of the system shown is _____.


(0, 2k)
(2k, 0)
(2k, k)

Answer 1

first of all you have to use substitution method
x + y = 3k
x - y = k
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x cancels out and it becomes 2y = 2k
so the y intercept will be just k
so the answer is the last one

Answer 2

If you use the addition method you can cancle out the y's first and have 2x=4k

Answer 3

then divide 2 from both sides to get x=2k

Answer 4

finally chose either problem to subsitute 2k for x to find why. I'll use the fist one. so 2k+y=3k

Answer 5

subtract 2k from both sides to get y=k
In this case your answer would be (2k,k)