Choose the best answer.
14. A helium atom has 2 electrons, each of
which has a -1 charge. Each proton has
a +1 charge. Overall, the helium atom
has no charge. How many protons must
the atom have?
A. -2
B. o
c. 2
D. 3

the answer is: the length is 5/6 yards.

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step-by-step explanation:

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