lesliejmckenna
lesliejmckenna lesliejmckenna
  • 02-08-2019
  • Mathematics
contestada

Determine which point is the solution to the given system.
y = -4/7x + 16
y = -2/7x + 12

A. (16, 1)
B. (21, 4)
C. (7, 12)
D. (14, 8)

Respuesta :

TaeKwonDoIsDead
TaeKwonDoIsDead TaeKwonDoIsDead
  • 03-08-2019

Answer:

D

Step-by-step explanation:

We equate both the y's and solve for x algebraically:

[tex]-\frac{4}{7}x+16=-\frac{2}{7}x+12\\16-12=-\frac{2}{7}x+\frac{4}{7}x\\4=\frac{2}{7}x\\x=\frac{4}{\frac{2}{7}}\\x=14[/tex]

Now taking the value x= 14 and putting it in the 1st equation would give us y:

[tex]y=-\frac{4}{7}x+16\\y=-\frac{4}{7}(14)+16\\y=8[/tex]

Hence the solution is (14,8), answer is D

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