dss354201 dss354201

04-06-2020
Mathematics

contestada

please help me. how would you change x + 3y = 18 -3x -12y = -75 to eliminate y showing all of the work

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KurdishPotato KurdishPotato

04-06-2020

Answer:

x = -3

y = 7

Step-by-step explanation:

x + 3y = 18

-3x - 12y = -75

multiply first equation by 4

4 × (x + 3y) = 18 ➡ 4x + 12y = 72

now add the two equations up

4x + 12y - 3x -12y = 72 - 75 (-12y will eliminate 12y)

x = -3

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