−3x + y = 4,

−9x + 5y = −1

Step-by-step explanation:

Option 1:

−3x + y = 4eq. 1

−9x + 5y = −1eq. 2

from eq. 1,

we get y = 4 +3xeq. 3

substitute eq. 3 into eq. 2.

-9x + 5(4 +3x) = -1

-9x + 20 + 15x = -1

-9x + 15x = -1 – 20

6x = -21

x = –3.5

to solve y, use the obtained x in eq. 3,

y = 4 + 3(–3.5)

y = -6.5

we know that

applying the law of sines

°

so

∠j=18°

∠k=29°

∠l=180-(18+29)=133°

the answer part a) is

the measure of angle k is  ≈29°

part b)  the measure of angle k could also be

(180-29)=151°

so

∠j=18°

∠k=151°

∠l=180-(18+151)=11°

the answer part b) is

the measure of angle k could also be 151°

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