Substitution/Elimination?

Question

I have a question regarding the y=ax+b equation. I want to know if someone could please help me solve this using substitution and elimination. I am completely lost:

using substitution and elimination solve for the following:

1. y=ax+b

a= 0.20 , b= -0.04

2. y=ax+b

a= 1.14 , b= -2.45

-thanks

Answer 1

I know for a fact when you use substitution, all you have to do is plug in the numbers for, let's say, A & B.  y= (0.20)x+ (-0.04)

I can't remember what else to do and I dont really remember elimination sorry..

Answer 2

1. y=ax+b

a= 0.20 , b= -0.04

2. y=ax+b

a= 1.14 , b= -2.45

rewriting

y = 0.2x - 0.04

y = 1.14x - 2.45

since we have y on one side of each, set them equal.

0.2x - 0.04 = 1.14x - 2.45

multiply by 100 to eliminate fractions

20x - 4 = 114x -245

combining terms

114x - 20x = 245-4

94x = 241

x = 2.56

y = 0.2x - 0.04

y = 0.2(2.56) - 0.04

y = 0.512 - 0.04 = 0.472

check the arithmetic...