Hey there!
Usually in equations, to clear the denominator, we multiply both sides by it. In our case here, the denominator is one, so when we multiply both sides by one we get the same thing. We can just remove the denominator:
c - 7 = 3
Using the property of equality which states that you do the same thing to both sides and get an equal equation, we can add seven to both sides in an effort to isolate x to get:
c = 10
To check, we plug in 10 for c:
10 - 7 = 3
3 = 3 (check!)
Hope this helps!
hope you find this helpful. :D
Answer:
Chocolate bars: $0.95 each
Sour keys: $0.05 each
Total cost for 8 chocolate bars and 24 sour keys: $8.80
Step-by-step explanation:
sour keys=x
chocolate bars=y
15x+2y=2.65
10x+3y=3.35
multiply the second equation by 1.5
15x+4.5y=5.025
2.5y=2.375
y=0.95
Chocolate bars are $0.95 each.
Now substitute the y value in one of the equations
15x+2(0.95)=2.65
15x+1.9=2.65
15x=0.75
x=0.05
Sour keys are $0.05 each.
For the second part of the question, just multiply the number of chocolate bars by the cost and same thing with the sour keys and add them.
Final answer: $8.80
$580 laptop/ $40 earned a week = about 14.5 weeks to buy the laptop
