I neeed the answers to these two please explain

Line cd passes through points c(1, 3) and d(4, –3). if the equation of the line is written in slope-intercept form, y = mx + b, what is the value of b? –5 –2 1 5

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

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?