Question

What is the solution to the system of equations? Y=2x-5. -8x-4y= -20

Answer 1

Y=2x-5
 -8x-4y= -20
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Substitute 2x-5 for y in  -8x-4y= -20
-8x-4(2x-5)=-20
-16x+20=-20
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Add -20 on each side
-16x+20+-20=-20+-20
-16x = -40
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Divide each side by -16
16x / -16 = -40 / -16
x = 5/2 or 2.5
now we have x
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To find Y Substitute 2.5 for X in y=2x-5
y = 2(2.5)-5
y = 0
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X = 5/2 or 2.5 and Y = 0