5x + 2y = 13
x + 2y = 9
Subtract :- ( note that 2y - 2y = 0):-
4x + 0 = 4
x = 1
From 2nd equation plug in x = 1
1 + 2y = 9
2y = 8
y = 4
Solution to this equation is x=1,y=4
2x + y = 7
5x - y = 14
Adding eliminates the y terms because y + -y = 0 :-
7x + 0 = 21
7x = 21
x = 3
Plug x=3 into second equation:-
5(3) - y = 14
y = 15-14 = 1
solution is x =3, y = 1
Answer:
94
Step-by-step explanation:
There is a common pattern.
4² = 16
Switch digits 16 ⇒ 61
5² = 25
Switch digits 25 ⇒ 52
6² = 36
Switch digits 36 ⇒ 63
7² = 49
Switch digits 49 ⇒ <u>94</u>
*Hint: When the slope of a line is perpendicular, it would have the negative reciprocal.
First, let's simplify this equation into y = mx + b format.
y - 3 = 5(x - 4)
y - 3 = 5x - 20
y = 5x - 17
Since 5 is the slope of this equation, the negative reciprocal would be -1/5.
Answer: -1/5
Answer:
in 7 days level of water changed in lake= -28
the water level change each day= -28/7= -4cm
Step-by-step explanation:
The function F(t) = 34000(.98)^t, since b = 0.98 < 1, hence the function is decaying and the initial value of the expression is 34,000.
<h3>Exponential equation</h3>
The inverse of exponential equation is logarithmic equation. The standard exponential equation is expressed as;
y = ab^x
where
a is the initial value
b determine the growth rate or decay.
If the value if b < 1, then it is a decay otherwise it is growth.
Given the function F(t) = 34000(.98)^t, since b = 0.98 < 1, hence the function is decaying and the initial value of the expression is 34,000.
Learn more on exponential function here: brainly.com/question/12940982
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