Use the substitution method
Answers:
6x-8y+1
6(1/2)-8(3/4)+1
Cross out 6 and 2 , divide by 2. 6/2= 3 , 2/2= 1, 3/1= 3
Cross out 8 and 4 divide by 4 . -8/4= -2 , 4/4= 1, -2/1= -2 and -2*3= -6
3-6+1
3-5
= -2
3xy-2x^ 2
3(4)(3)-2(4)^ 2
(3)(4)(3)= 36
write out 4 and 4 ( two times because of the exponent)
4*4= 16
36-2(16)
Mutiply first then subtract
-2*16= -32
36-32
= 4
