You may write them separating the units and tens digits, and then use FOIL to add 4 easy tems. For example, let's compute :
Answer:
{y,x}={5,2}
See steps
Step by Step Solution:
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System of Linear Equations entered :
[1] y-x=3
[2] 2x+y=9
Equations Simplified or Rearranged :
[1] y - x = 3
[2] y + 2x = 9
Graphic Representation of the Equations :
x + y = 3 2x + y = 9
Solve by Substitution :
// Solve equation [2] for the variable y
[2] y = -2x + 9
// Plug this in for variable y in equation [1]
[1] (-2x+9) - x = 3
[1] - 3x = -6
// Solve equation [1] for the variable x
[1] 3x = 6
[1] x = 2
// By now we know this much :
y = -2x+9
x = 2
Solution :
{y,x} = {5,2}
1.) C
2.) A
3.) B
4.) C
5.) idk
6.) A
7a.) non proportional because the line does not pass through the origin (0,0)
7b.) The slope is -2x
7c.) The y-intercept of the line is -3.
7d.) The equation of the line is y = -2x - 3
Q1. Interest is paid from the loan value. The remaining amount is the proceeds.
... I = Prt = $1000·0.12·(120/360) = $40 . . . . amount of interest
The proceeds are then
... $1000 - 40 = $960
Q2. In the absence of loan fees, the given annual rate is the APR, 18.0%.
The effective rate when 18% is compounded monthly is
... (1 +0.18/12)^12 - 1 ≈ 19.6%
This does not appear to be what the question is asking.