{-2x + 7y = -5
{-2x - 4y = 6 | · (-1)
{2x + 4y = -6 (+)
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-2x + 2x + 7y + 4y = -5 + (-6)
11y = -11 | : 11
y = -1
{y = -1
{2x + 4y = -6
{2x + 4 · (-1) = -6
{2x - 4 = -6 | + 4
{2x = -2 | : 2
{x = -1
Answer:
a=40. b=140. c= 40
Step-by-step explanation:
b is congruent To 140 because of the vertical angles postulate that states two angles vertical from one another are congruent.
a is 40 because it is Supplementary to b Which means that the sum of a and b must add up to 180.
c is Congruent to a due to the vertical angles postulate
100
(b/2)^2
b= -20
(-20/2)^2
(-10)^2
