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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? The silica content of magma greatly affects its viscosity. Magma with a high silica content has a? How many edges in a circle? 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? Describe how and where new crust material is made. Describe how and where old crust is destroyed.?