Do you know the method of determinants?
http://coolmath.com/algebra/14-determinants-cramers-rule/02-determinants-3x3-method-1-01.htm
1) D= -2.6+5=2.4
then x= (-26+25)/D
and y= (6.5-13)/D
2. D= 2.7*(-4)-(3*(-2)= you do it.
then x= (2.7*19-3(-1))/D
try this, most of it can on a 2x2 be done in your head.
and you can CHECK your answers here
http://math.cowpi.com/systemsolver/2x2.html
I need help with my math pizzazz worksheet page 167
1.3x-5y=13
X-2y=5
2.7x-2y=-1
3x-4y=19
3.2x+3y=7
3x+4y=10
4 answers
1/2t + 6 = -7
where is integer or fraction
3(2x+5)=39
13 answers