Find the slope and y-intercept of 5x - 4y = 20.

slope =

y-intercept =

➷  Rearrange so that it is in the standard y = mx + c form

5x - 4y = 20

+4y to both sides

5x = 20 + 4y

-20 from both sides

5x - 20 = 4y

Divide both sides by 4 to isolate y:

y = 5/4x - 5

In this format the 'm' is the slope and the 'c' is the y intercept

Thus, the slope is 5/4 and the y intercept is -5

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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

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step-by-step explanation: