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How do you do #1- 3x + y = 17 4x + y = 18 find for x and y
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How do you do #1-

3x + y = 17
4x + y = 18

find for x and y

User Ironzionlion
by
6.2k points

1 Answer

5 votes
1st multiply the top equation by -1 to get -3x - y = -17 then add the 2 equations together to get:

4x + y - 3x - y = 18 - 17
x = 1 (simplified down)

Now plug the 1 into either equation
4(1) + y = 18
4 + y = 18
y = 18 - 4 = 14

Your point is (1, 14)
User Gulpr
by
5.8k points
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