Answer:
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Step-by-step explanation:
You get 3x + 4x, +4- -3,and +3 + 4
Answer:
Combine like terms
Step-by-step explanation:
+ 8x
+4y
+4
8x + 4y + 4
Subtract the first equation from twice the second.
2(4x +5y) -(8x -3y) = 2(-9) -(21)
8x +10y -8x +3y = -18 -21
13y = -39
y = -3
Then we can find x by substitution into the first equation.
8x -3(-3) = 21
8x = 12 . . . . . . . subtract 9
x = 12/8 = 3/2
The solution is (x, y) = (3/2, -3)
Answer:
Shown Below
Step-by-step explanation:
Shown Below
1. 3^x=81 3^4=81 x=4
2. 169^x=13 x= 1/2
3. 5^x= 1/5 x= -1 (inverse)
4. 0.5^x=4 x= -2
5. 2^x= 1/2 x =-1