vlactawhalm29
13.07.2019 •
Mathematics
Check my answers? 1. solve the system of equations: -10x-3y=-18 -7x-8y=11 [ a) (-7,-10) ] b) (3-4) c) (-4,-3) d) (2,-1) 2. solve the following system of equations by graphing: -4x+3y=12 -2x+3y=-18 [ a) (2.67,-2) ] b) (1,-5.33) c) (-3,-8) d) (-15.-16) 3. what is the solution to the system of equations? y=3x+7 y-x-9 a) (-1,-10) b) (-17,-8) c) (4,19) [ d) (-8,-17) ]
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Ответ:
3. D)
2. D)
1. B)
Step-by-step explanation:
3.
{y = 3x + 7
{y = x - 9
x - 9 = 3x + 7
-3x - 3x
____________
−2x - 9 = 7
+ 9 + 9
__________
−2x = 16
____ __
−2 −2
[Plug this back into both equations above to get the y-coordinate of −17];
__________________________________________________________
2.
{−4x + 3y = 12
{−2x + 3y = −18
−½[−4x + 3y = 12]
{2x - 1½y = −6 >> New Equation
{−2x + 3y = −18
_______________
1½y = −24
____ ____
1½ 1½
[Plug this back into both equations above to get the x-coordinate of −15];
__________________________________________________________
1.
{−10x - 3y = −18
{−7x - 8y = 11
−⅜[−7x - 8y = 11]
{−10x - 3y = −18
{2⅝x + 3y = −4⅛ >> New Equation
_________________
−7⅜x = −22⅛
______ _____
−7⅜ −7⅜
[Plug this back into both equations above to get the y-coordinate of −4];
I am joyous to assist you anytime.
Ответ:
Step-by-step explanation:
Explanation:
Density,
ρ
=
Mass
Volume
.