The sum of 7 times one number, x, and 4 times a second number, y, is 148. If the sum of the two numbers is 31, find the two numb
1 answer:
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Answer:
40 black ink cartridges and 19 colored ink cartridges
Step-by-step explanation:
Let represent the number of black printer ink cartridges sold. Let
represent the number of color printer ink cartridges sold.
Set up a system of equations:
Substitute:
⇒ 40 black ink cartridges, 19 colored ink cartridges (ans)
Answer: x=5 y=-6
(5,-6)
Step-by-step explanation:
Solve by elimination
multiply x-5y=35 by 3
= 3x-15y=105
-
divide 9 on both sides
y= -6
Now solve for x
you must plug in -6 for y in either equations
i plugged in -6 for y in 3x-15y=105
subtract 90 on both sides
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