When an equation in first degree is given in the form y=mx+b then this can immediately be graphed with a slope of m and y intercept of b. A first degree equation is an equation that does not contain any variables raised to second power or greater.
The given equation is x+y=3...
Adding to Andre's answer:
The polynomial x2 -5x +15 is a quadratic and represents a parabola that opens upward and vertex at (2.5, 8.75). This parabola does cross the x axis, so at no point is y < 0
Let's say there are r rabbits and b birds
Since there are 170 heads and each bird and rabbit has one head, we can write the following first equation
r + b = 170 ----------------let's call this equation 1
Also, each rabbit...