Question

Write an equation of the line that passes through the points (-7,-3) and (8, -3)

y=

Answer 1

y = - 3

Explanation:

Call the line y = a + bx (d)

Since d go through (-7;-3) so -7 = a - 3b (1)

Since d go through (8;-3) so 8 = a - 3b (2)

From (1) and (2), we have equations:
`\left \{ {{a - 3b = -7} \atop {a - 3b = 8}} \right.`

Solve the equations, we have
`\left \{ {{a = 0} \atop {b = -3}} \right.`