Solve 4x−5=7+4y for y.
2 answers:
Answer:
y = x - 3
Step-by-step explanation:
Given equation,
4x - 5 = 7 + 4y
For finding the equation for y,
We need to isolate y in the left side of the equation,
Now,
Add 5 on the both sides of the above equation,
4x = 7 + 4y + 5
Subtract 4y on the both sides,
4x - 4y = 12
Subtract 4x on both sides,
-4y = 12 - 4x
Divide both sides by -4,
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Yes, Bobby will have enough money if he saves for 9 weeks. You can find this through either substituting w for 9 in the equation, or solving the equation itself.
Substituting:
Substitute w for 9.
Simplify.
Solve.
255 is greater than 250, so yes, he will have enough money saved.
Solving the equation:
Original Equation
Subtract 30 from both sides.
Divide both sides by 25.
The number of weeks he needs is 8.8. When rounding it up, you get 9.
Substituting:
Substitute w for 9.
Simplify.
Solve.
255 is greater than 250, so yes, he will have enough money saved.
Solving the equation:
Original Equation
Subtract 30 from both sides.
Divide both sides by 25.
The number of weeks he needs is 8.8. When rounding it up, you get 9.