Solve the systemsolve the system by either substitution or elimination 4x + 4y = 20, 2x -2y = -18 by either substitution or elimination

3. solve the given inequality and graph the solution on a number line.

Is each relation a function? if so, state whether it is one-to-one or many-to-one. 3. (-4,7), (-3,5), (1,4), (3,-8), (5,-11) 4. (-4,8), (-2,4), (0,1), (2,4), (4,8) 5. (-2, 1), (-2,3), (0,-3), (1,4), (3,1)

What is the value of x when x + 7 = 21?