D because D as a non-fraction is 6.8
Answer:
x = 9
Step-by-step explanation:
1) Subsitute! You have to replace y with 2x - 2 in 3x -y = 7, b/c they already gave you the equation for y (in the second part: y = 2x - 2)
So, your equation would look like this : 3x - (2x - 2) = 7
3) Solve suing PEMDAS!
There's a negative outside the parenthesis of 2x -2 -> - (2x-2). Multiply the negative individually inside the parenthesis so you will get (-2x + 2)
3x - 2x - 2 = 7 subtract the same variable; x
1x - 2 = 7 you don't need to put 1 to x, only if you want!
+ 2 + 2 add 2 on both sides
x = 9
Answer:
To find the value of y, you need to isolate the variable. To do this, add 21 to -12. This gives you 9. Now, you're equation is set as 9 = y. This means that the value of y is 9.
Step-by-step explanation:
Answer:
40 square yards
Step-by-step explanation:
The backyard is rectangular and it's dimensions are 7 yards long and 8 yards wide.
The area of a rectangle is given as:
A = L * W
where L = length
W = width
Therefore, the area of the backyard is:
A = 7 * 8 = 56 square yards
Elliana wants to plant sunflowers on 16 square yards of the backyard and the rest of the backyard will be used for a pool.
The area left for the pool will therefore be:
56 - 16 = 40 square yards
40 square yards will be left for the pool.
Answer:
786
Step-by-step explanation:
6•1=6
6•30=180
6•100=600
600+180+6=786
