Sorry, I wish I could help, but I haven't learned this yet
;-;
The answer is 5 and i am writing this other stuff because it said my answer was short
1) (-7,2)
y=2, -x+4=11, -x=11-4=7, x=-7
2) (-3,4)
-x+2y=11
y=4, -x+8=11, -x=3, x=-3
3) (1,6)
-x+2y=11
y=6, -x+12=11,-x=-1, x=1
Step-by-step explanation:
if 70% of the orice is 420 then
70x = 100 × 420
70x = 42000
x = 42000/70
x = 600