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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? =B y I y is an integer and ≤−4 Describe how and where new crust material is made. Describe how and where old crust is destroyed.? If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? Discrete Help ASAP. Please write out symbolic notation.?