H. E. L. P. 5 points

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Ineed with math stuff it involves graphs