System of equations and its solution are given below.

system a

5x - y= -11
3x - 2y=-8

solution (-2,1)

to get system b below, the second equation in system a was replaced by the sum of that equation and the first equation in system a multiplied by -2.

system b

5x - y = -11
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What is the value of x in the equation 2(x-4) = 4(2x + 1)?

What is the expression in factored form? -20x^2 - 12x a. 4x(5x+3) b. -4x(5x-3) c. -4(5x+3) d. -4x(5x+3)

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?