- To invert 2*2 matrix modulo n?

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Could someone help me with these math problems? I can't figure them out. Solve the linear equation;
x+2y=15
y=-2x+0 9x-12y=-3
-12x+16y=4? If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? Describe how and where new crust material is made. Describe how and where old crust is destroyed.? 0.8 litres water is how many cups? White light is directed at difraction grating at angle normal to gratting.starting at norml to grating 0dgre the odr of red,gren,blue wil be?