Box A : 8.25
Box B : 8.2
Box C : 8.225
Box D : 8.05
heaviest box is box A
X=3 and y=5. To solve the system algebraically, I think you just have to plug in the answers. I'm not quite sure for (b)
No, y does not vary directly with x. When y varies with x, it means that y and x always have the same ratio. Simplified, the first ratio is 1:5 and the second and third ratios simplified are 1:6. Therefore, y does not vary with x.
Don't let them fool you. This is algebra.
1
a. Replacing equals with equals
b. Adding -12 to both sides
c. Multiplying both sides by 1/9
2
a. Associativity, replacing equals
b. Adding -8 to both sides
c. Multiplying both sides by 1/9
3
a. Distributive law
b. Adding -6x to both sides
c. Multiplying both sides by -1
4.
a. Replace equals with equals
b. Add -6m to both sides
c. Add -5 to both sides
d. Multiply both sides by 1/2
5. Symmetric property
6. Distributive property
7. Reflexive property
8. Transitive property