If y varies directly as x, and y = 8 when x=7, find y when x= 14.

When x = 14, y = 16

Step-by-step explanation:

y ∝ x

y = kx

Substituting 'y = 8' and 'x = 7' into the above equation:

8 = 7k

k = 8/7

Hence, y = 8/7x

Substituting 'x=14' into the above equation:

y = 8/7 * 14

= 8 * 2

= 16

Hence, when x = 14,

y = 16

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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