Solve the system of equations using substitution.
3x + 7y = 19
-X + 8y = -27

x= 11

y= -2

Step-by-step explanation:

8y + 27 =x

3(8y+27) + 7y =19

24y + 81 + 7y =19

31y + 81 =19

      -81    -81

31y = -62

31       31      

y = -2

-x + 8(-2) = -27

-x - 16 = -27

   +16    +16  

-x = -11

x= 11

constant acceleration- a

constant velocity- c

no velocity or acceleration- b

explanation:

for body moving with a constant acceleration, the rate of change of displacement changes over time. this is proven by the increasing gradient of the curve (a) against time.

a body that is moving at constant velocity covers equal distances over equal periods of time, thus the straight line with a constant gradient c.

a stationary body   covers no displacement as time elapses. thus the flat line with   zero gradient.