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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? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? =B y I y is an integer and ≤−4 If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? A constant current of 1A flow in circuit over period of 5s.total charge flowing through circuit over this duration will be.
Expert plz and?