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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step-by-step explanation:

answer: c

(2, -4)

goes 7 to the

(9, 4)

easy