3a should be 9/16.
3b should be 56.25%
.006, hope that helps, multiplying or dividing by ten you can just move the decimal point
<span>2y = 4x + 8 ------> y = 2x + 4
4y = 4x + 20 ------> y = x+5
2x+4 =x+5
x = 1
y=x+5=1+5=6
Check:
</span>2*6 = 4*1 + 8 , 12 =12
4*6 = 4*1 + 20, 24 =24<span>
x=1,y=6
(1,6)
</span>
The student made error in step 2 because negative multiplied by positive is negative. Also negative multiplied by negative is positive
