Consider the system: Line 1: x - y = 9
Line 2: 3x + 3y = 3
The ordered pair (3, -6) is a solution to:
Line 1
Line 2
The System of Equations

Line 1

Step-by-step explanation:

Since x=3 and y=-6, just plug those two values in both of the equations.

Line1: (3)-(-6)=9    This would be the answer

Line2: 3(3)+3(-6) = -9  This is the incorrect answer because it should 3

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb