Substitution means making one formula equal to a variable in the second formula to plug it in, and elimination means the cancelling out of one variable in order to make it easy to solve.
1. x-4(-x+5)=10
x+4x-20=10
5x=30
x=6, plug in 6 into original equation, y=-1
2. <u>-1(2x</u>-5y=6)
<u>2x</u>+3y=-2 underlined means cancelled, so you add the rest up on each side
5y+3y=-6+-2
8y=-8
y=-1, plug in this value to original equation, x=.5
3. 2(x+5)=2x+10
2x+10=2x+10
Infinite solutions
4. y=<u>4x</u>-3
-<u>4</u>(y=<u>x</u>+6) underlined means cancelled
-3y=-27
y=9, plug into original, x=3
Answer:
Irrational.
Step-by-step explanation:
The square root of 35 is not a perfect integer.
Answer:
4x-12
Step-by-step explanation:
4 x x is 4x and 4x-3 is -12
Answer:
The answer is $30.72
Step-by-step explanation:
25.60 + 20% = 30.72
You have to divide 25.60 / 20% and that would be 5.12 so to the original answer 25.60 you add 5.12.
Final Answer
30.72
Answer:
H=8
Step-by-step explanation:
12.2H-7.15=90.45
12.2H=90.45+7.15
12.2H=97.6
H=8
