Christine is building a deck in her backyard. In order to place the posts, she will make concrete using a mixture. The mix
requires 1 part water to 2 parts cement to 3 parts sand. The
relationship between water, cement, and sand is proportional. If
she has 25 pounds of cement and will use it all, how many
pounds of sand will she need? One gallon of water weighs
about 8.34 pounds. How many gallons of water will she need?
Round to the nearest tenth.

i don't know YET

Step-by-step explanation:

i'm really not sure im going to target (the store) i'll tell you in about 4 hours because maybe i'll go have dinner anyways brb i'll solve it when i get home

1,645,493,059.35

step-by-step explanation:

(0,-3) see attached graph

step-by-step explanation:

a. to solve the system, graph the two equations.

x = y+3 becomes y=x-3 has m=1/1 and b=-3. start at (0,-3) on the y-axis and plot a point. then move up 1 unit and 1 unit to the right. plot a point and connect.

y=-4x+3 has m =-4/1 and b=-3. start at (0,-3) on the y-axis and plot a point. then move down four units and to the right 1 unit. plot a point and connect.

the solution is the point (x,y) where the two lines intersect. by the graph below it is (0,-3).

b. to solve by substitution, substitute y = -4x-3 into x= y+3

x= (-4x-3) +3

x=-4x

5x=0

x=0

now substitute x = 0 back in to find y.

y= -4(0)-3

y=0-3

y=-3

solution is (0,-3)

c. use elimination by adding the equations together.

x-y=3

4x+y=-3

5x=0

x=0

then substitute into one equation to find y.

y=-4(0)-3

y=-3