imani0512 imani0512

15-09-2017
Mathematics

contestada

what is the solution?
y=-x+21
y=-2x+30

a. (8,12)
b. (9,11)
c. (8,11)
d. (9,12)

Respuesta :

texaschic101 texaschic101

15-09-2017

-x + 21 = -2x + 30
-x + 2x = 30 - 21
x = 9

y = -2x + 30
y = -2(9) + 30
y = -18 + 30
y = 12

solution is (9,12)

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