Solve the following system using a matrix. 7a - b = -1 -4a - 2b = -2

1. a=-1+b/7 is the right answer.    First you had to add by b from both sides of equation, and it gave us, . And then simplify, and it gave us, . Divide by 7 from both sides of equation, and it gave us, . Finally simplify, and it gave us the answer is a=-1+b/7 is the right answer.

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2. a=-b-1/2 is the right answer.     First you had to add by 2b from both sides of equation, and it gave us, . And then simplify, and it gave us, . Next you can also divide by -4 from both sides of equation, and it gave us, . Finally simplify, and it gave us the answer is a=-b-1/2 is the right answer. Hope this helps! And thank you for posting your question at here on , and have a great day. -Charlie

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10/60

step-by-step explanation:

if you divide 10 by 60 the answer is 0.166666 while if you divide or solve the other problems it equals 0.6

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.