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talyku843
10.06.2021 •
Mathematics
Solve the system of equations – 2x + y = –8 and 4x– 6y = –24 by combining
the equations.
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Ответ:
4
Step-by-step explanation:
Multiply the second equation by −2 to get −4x − 12y = −48.
Step-by-step explanation:
Given:
4x + y = 4 (1)
2x + 6y = 24 (2)
Multiply the second equation by −2 to get −4x − 12y = −48.
4x + y = 4 (1)
−4x − 12y = −48 (3)
Variable x can be eliminated by adding the equations
4x + (-4x) + y + (-12y) = 4 + (-48)
4x - 4x + y - 12y = 4 - 48
0 - 11y = -44
-11y = -44
Divide both sides by -11
y = -44/-11
= 4
Ответ:
8) If the base of the exponents match on both sides of the equal sign, then the exponents can be set equal to each other.
So since (5ˣ)⁵ = 5³⁵, the base 5 is on both sides.
5(x) = 35
5x = 35
Divide by 5 on both sides to isolate the variable.
x = 7
9) Without evaluating (much) you can tell by common sense that (2⁵)(10⁵) is bigger.
The exponents are the same so you can multiply the bases. 4x5 = 20. 2 x 10 = 20. Now, just look at the exponents to see which is bigger. 5 > 4. Therefore, (2⁵)(10⁵) is bigger.
10) Nicholas's second statement is false. (2⁶)(2⁶) is the same as (2⁶)². In this case since they have the same base, you would multiply the exponents. 6 x 2 = 12. Therefore, (2⁶)(2⁶) = 2¹²