Question 706713
y = -2/3x + 7  (this is correct)
-3a = -2/3(a) + 7  (when you substitute, you should get this)
.
Now, all we need to do is solve for 'a':
-3a = -2/3(a) + 7
start by multiplying both sides by 3:
3(-3a) = 3(-2/3(a) + 7)
-9a = -2a + 21
adding 2a to both sides:
-7a = 21
divide both sides by -7:
a = 21/(-7)
a = -3