Answer:
x = 8, y = 2
Step-by-step explanation:
2x - 7y = 2 (1)
4x + 5y = 42 (2)
2x = 2 + 7y (1)
2(2 + 7y) + 5y = 42 (2)
4 + 14y + 5y = 42
19y = 38
y = 2
2x = 2 + 7(2) = 16
x = 8
<h3>
Answer: -10</h3>
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Work Shown:
First we need to evaluate f(3)
f(x) = -x^2 + 2x
f(x) = -(x)^2 + 2(x)
f(3) = -(3)^2 + 2(3) ... replace every x with 3; apply PEMDAS to simplify
f(3) = -9 + 6
f(3) = -3
Then we subtract 7 from both sides
f(3) - 7 = -3 - 7
f(3) - 7 = -10
Step-by-step explanation:
-4m -5n = 1 ------------------(1)
-6m +12n = -18--------------(2)
multiplying eq (1) by 3 and (2) by 2
therefore, the new eq obtained is
-12m -15n = 3 --------------(3) subtracting (3) AND
-12m +24n = -36-----------(4) <u>(</u><u>4</u><u>)</u>
(+) (-) (+)
-----------<em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em>
<em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em>-</em><em>3</em><em>9</em><em>n</em> = 39
n= -1 ------------(5)
subtituting (5) in (1)
therefore,
-4m -5×-1 =1
-4m +5=1
-4m=1-5
-4m=-4
m= 1
hence calue of m is 1 and n is -1
Answer:
domain) all real numbers
range) all real numbers
Step-by-step explanation:
y=15-9x
there are no illegal values for x that would make the equation invalid so domain is all real numbers
this line is not flat so range is also all real numbers