Answer:
(There's a confusion here, is x 2 x times 2? The answer and explanation are based on x multiply by 2)
y = -8
Step-by-step explanation:
Substitution Method-
y = x 2 - 4
x = -2
y = (-2) 2 - 4
PEMDAS - parentheses; exponents; Multiplication & Division; Addition & Subtraction
we are going to multipl -2 and 2 together ---> -4
y = -4 - 4
Same sign add, different sign subtract.
Same sign keep the sign, different sign keep the larger.
y = -8
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Answer: 2714.34m3
Step-by-step explanation:trust bra
Answer:
The numbers are 91 and 81
Step-by-step explanation:
Let:
x be the first number.
y be the second number.
The sum of two numbers is 172.
x + y = 172
Their difference is 10.
x - y = 10
Try to arrange for solving x:
x - y = 10
x = 10 + y
Now substitute the x to the first equation.
x + y = 172
(10 + y) + y = 172
10 + y + y = 172
10 + 2y = 172
2y = 172 - 10
2y = 162
y = 162 ÷ 2
y = 81
Now solve for x:
x + y = 172
x + (81) = 172
x = 172 - 81
x = 91
Now let's check one more time:
The sum of two numbers is 172:
91 + 81 = 172
172 = 172 (correct)
Their difference is 10:
91 - 81 = 10
10 = 10 (correct)
Answer:
<h2>a = 0</h2>
Step-by-step explanation:
