Answer
x=-2 and y=-3
Step-by-step explanation:
Step: Solvey=5x+7for y:
Step: Substitute5x+7 for y in 3x+y=−9:
3x+y=−9
3x+5x+7=−9
8x+7=−9(Simplify both sides of the equation)
8x+7+−7=−9+−7(Add -7 to both sides)
8x=−16
8x/8=−16/8
(Divide both sides by 8)
x=−2
Step: Substitute−2 for x in y=5x+7:
y=5x+7
y=(5)(−2)+7
y=−3(Simplify both sides of the equation)
Answer:
48
Step-by-step explanation:
47.999
The number in the thousands place is above 5, so add 1 to the digit in the hundreds places
47.90 + 0.09+0.01
47.9+0.1
48
100000000
8 zeroes in a trillion
6 √5
7 π
Both continue on forever and will never have an exact answer - therefore, they're irrational.
