Question 3(multiple choice worth 4 points)
simplity 5-^4 / 5^3
5^7
5-^1
1/5
1/5^7

1/5^7

Step-by-step explanation:

take the exponents and subtract them so -4 - 3 gives you -7. Negative exponents should be expressed positively, therefore you have 1/5^7

l.jnl.j/n.m,lm,

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