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04-03-2020
Mathematics

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Will you please take time to help me solve this problem and explain the steps of how you did it?
-4×+y=6
-5×-y=21

Respuesta :

04-03-2020

-4x+y=6
-5x+y=21

Step 1: Pick an equation & solve for x
-4x+y=6
-y -y
-4x=6-y
x=(6-y)/4

Step 2: Plug in the equation you just got into the x in the second equation
-5((6-y)/4)=21

Step 3: Solve for y
(-30+y)/4=21
-30+y=84
+30 +30
y= 114

Step 4: Plug in the y into the first equation and solve for x
-4x+114=6
-114 -114
-4x=-108
x= 27

Answer: x=27 & y=114

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