Suriko is washing cars to raise money
for an animal shelter. he charges
$4.00 per car. he washes 23 cars in
one day. sixty-five percent of suriko's
earnings paid for the supplies he
used. how much is left to donate
to the animal shelter?
a $92.00
b $59.80
c$32.20
d $27.00

8,400-6,400=xx/6,400anyways the percent increase is 31.25% or 0.3125 you can round if you can

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.