Answer:
A
Step-by-step explanation:
-15(-8)
=+(15*8)
=120
So, the ans is A
Answer:
Option F
Step-by-step explanation:
F). x + y = 3 -------(1)
x - 3y = -2 --------(2)
Equation (1) minus equation (2)
(x + y) - (x - 3y) = 3 - (-2)
4y = 5
y = 1.25
Hence, y is positive.
G). x + y = 3 --------(1)
x + y = -2 --------(2)
Both the equations represent parallel lines.
There are no solutions of the given equations.
H). x - 3y = -2 -------(1)
x + y = -2 -------(2)
Equation (2) minus equation (1)
(x + y) - (x - 3y) = -2 - (-2)
4y = 0
y = 0
Since, 0 is neither positive nor negative, y will be neither positive nor negative.
J). x + y = 3 -------(1)
x - y = 3 --------(2)
Equation (1) - Equation (2)
(x + y) - (x - y) = 3 - 3
2y = 0
Hence, y is neither negative nor positive.
Therefore, Option F is the answer.
Answer: There are 20 veggie burgers.
There are two ways you can solve this:
Let x represent turkey burger and y for veggie burger.
2x + 1.50y = 90
x + y = 50
Work:
-2(x + y = 50)
-2x + -2y = -100
2x + 1.50y = 90 << Add like terms
+ -2x + -2y = -100
______________
-0.50y = -10 << Solve for y
y = 20
____________________________
Let x represent turkey burger and y for veggie burger.
2x + 1.50y = 90
x + y = 50 << Solve for x
x = 50 - y << Plug in y for 2x + 1.50y = 90
2(50 - y) + 1.50y = 90
100 - 2y + 1.50y = 90
-0.50y = -10
y = 20
Any fraction with no whole number in front an a - sign before it, so like -4/5 or -2/3