Find the equation of the line that contains the point (−4,−1) and is perpendicular to the line 4x+5y=15.

Step-by-step explanation:

4x+5y = 15

slope of line is -⅘

perpendicular to the line is 5/4

point-slope equation for line of slope 5/4 through (-4,-1):

y+1 = (5/4)(x+4)

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

3x + 4y -25 =0 represents the amount of change sianna should recieve