Answer:
9
Step-by-step explanation:
Y intercept when x = 0
Y = 9
Answer:
4x+8=-24 and
4x=-32
Step-by-step explanation:
2/3(6x+12)=-24
or,12x+24=-72
or,x=-72-24/12
•°•x=-8
4x+8=-24
or,x=-24-8/4
•°•x=-8
4x=-32
or,x=-32/4
•°•x=-8
Answer:
18 Pounds
Step-by-step explanation:
Variable: s=how much you sister weighs
One equation would be:
94 - s = 112
You then have to isolate the variable by subtracting 94 from each side to get:
s=18
I don't if I explained it that well.
Call the two equations above A and B, in order to not confuse them.
A: -2x + 6y = -38
B: 3x - 4y = 32
For this system we have opposites in x and y, so Elimination (or Linear Combination) works best. Either variable works, so let's work with x first and multiply A by 3 and B by 2. This is done so we get opposites in A and B then when added together give zero.
-2x + 6y = -38 ------> multiply by 3 ----> -6x + 18y = -114
3x - 4y = 32 ------> multiply by 2 -----> 6x - 8y = 64
Now we add the new equations. The -6x and 6x are opposites and go away. We are left with
10y = -50. We divide both sides by 10 and get that y = -5.
Now we take y = -5 and put it into an original equation. Let's use A.
-2x + 6y = -38 the original equation A
-2x + 6(-5) = -38 we found y = -5
-2x + (-30) = -38 evaluating and multiplying
-2x - 30 = -38 apply the parentheses
-2x = -8 add 30 to both sides
x = 4 divide on both sides by -2
Thus x = 4 and y = -5, or (4, -5) is the solution.
+2x-15=0
+2x=0+15
2x=15
X=15/2
X=15/2 or 7,5
