He messed up in the beginning with the 4.
It's supposed to be
(3 - -4)
(3 + 4)
and not
(3-4)
That's where he messed up.
I find it interesting how he uses Xa Ya and Xb Yb. In my school we use X1 Y1 and X2 Y2.
Answer:
350 + 30W = S
Step-by-step explanation:
Since (W) represents the number of weeks he's saving money, you'd replace (W) with 14.
350 + 30(14) = S
x+30=2x-70, x-70=30, x=100
180=(2(100)-70)+5y, 180=130+5y, 50=5y, y=10
