Two​ trains, Train A and Train​ B, weigh a total of 399 tons. Train A is heavier than Train B. The difference of their weights is 249 tons. What is the weight of each​ train?

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70

(- 1, 0 )

step-by-step explanation:

an x- intercept is where the function crosses the x- axis.

to find the x- intercept/s look for the value of x when f(x) = 0

from the given table there are 3 values of x where f(x) = 0

when x = - 1, x = 2, x = 3

the one that is listed is (- 1, 0 )

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.