Answer:
Lindsay owns 12 books
Step-by-step explanation:
1/3x:Lindsay
x:Destiny
1/4x: Henry
1/3x+1/4x+x=57
4/12x+3/12x+x=57
7/12x+x=57
19/12x=57
x=57*12/19
x=36
1/3x=36/3
1/3x=12
Answer:
B.
Step-by-step explanation:
It’s a I think. I hope you get it right /)
Answer:
C (as marked)
Step-by-step explanation:
The only offered choice that has the correct sums (23 and 26) is choice C.
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<em>Additional comment</em>
The purpose of each of the equations is to express the total cost of the described purchase. If x is the cost of a hamburger, then the cost of two hamburgers is 2x. Likewise if y is the cost of a drink, then the cost of 5 drinks is 5y. The total cost of 2 hamburgers and 5 drinks will be ...
2x +5y
This value is said to be $23, so the appropriate equation for this relation is ...
2x +5y = 23 . . . . . part of answer choice C only
Answer:
Step-by-step explanation:
We need a system of equations to help us solve this. One of the equations in the system is about the number of cultures bought, and the other one is about the money spent on the cultures. They are 2 very different things!
The #'s equation says that the number of cultures (c) plus the number of vials (v) totaled 57. The equation that puts that together is
c + v = 57
Now for the money part. Each culture costs $8, so the expression for that is 8c; each vial costs $1, so the expression for that is 1v; we know the amount of money spent in total was $106. The equation for that is
8c + 1v = 106
There's our system. 2 unknowns need 2 equations. Go back to the first one and solve it for either c or v. I'll solve for c, just because:
c = 57 - v. Now sub that value for c into the money equation:
8(57 - v) + v = 106 and
456 - 8v + v = 106 and
-7v = -350 so
v = 50. There are 50 vials of fruit flies. To find c, plug that into the first equation:
c + 50 = 57 so
c = 7.