69) 12/10
70)8∏/25∏
71)17∏/20∏
72)8/5
Using the units of measure for each
1. 4.5 × 10^<span>5
2. </span>3.2 × 10^2<span>
3. </span>3.21 × 10^<span>7</span>
Ok, let’s take it step by step.
Take the first equation and solve for x.
x-3y=27
x=3y+27
Substitute x into the second equation.
2(3y+27)=6y-14
6y+68=6y-14
68=-14
Since 68 does not = -14, the system of equations has no solution.
2x + 3y = 3
3x - 2y = 11
<span>( 2x + 3y = 3 ) *3</span>
6x + 9y = 9
<span>( 3x - 2y = 11 ) * 2
</span>6x - 4y = 22
subtract those two equations
13y = -13
y = -1
x = 3
