3 years ago

Jonathan counted a

Mathematics

1 answer:

Svetach [21]3 years ago

6 0

Answer:

36 White cars

Step-by-step explanation:

total of 40 white cars and yellow cars" means 40 = W + Y

"9 times as many white cars as yellow cars" means 9Y = W

9W + 9Y = 360 (first equation; multiply (W+Y=40) by 9 to eliminate Y)

W - 9Y = 0 (carefully revise the second equation)

------------------- (Elimination method: add the equations)

10W = 360

W = 36 Ans: 36 White cars

Checking (very important):

40 = W + Y

40 = 36 + Y

4 = Y

is 9(4) = 36

36 = 36

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