noellequanstrum noellequanstrum

18-05-2017
Mathematics

contestada

how do you do #1-

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

find for x and y

Respuesta :

Аноним Аноним

18-05-2017

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)

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