How do you solve this systems of equations problem

2r +3s=-5
6s=2r

see explanation

Step-by-step explanation:

Given the 2 equations

2r + 3s = - 5 → (1)

6s = 2r → (2) ( divide both sides by 2 ), then

r = 3s

Substitute r = 3s into (1)

2(3s) + 3s = - 5

6s + 3s = - 5

9s = - 5 ( divide both sides by 9 )

s = -

Substitute this value into either of the 2 equations and evaluate for r

Substituting into r = 3s, then

r = 3 × - = -

Solution is r = - and s = -

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).

answer: your answer is a