FiMH THEO 3x +7=28

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Solve the equation 3x+7=28

Is the line 3x + 4y + 7 = 0 perpendicular to the line 28x - 21y + 50 = 0 ?

Find a if 3,a,7,28 are in proportion.

Solve, using cross - multiplication : 4x - 7y + 28 = 0 and -7x + 5y + 9 = 0 .

Find x when 7:x::x:28

Let's solve the following equation. 12x + 8 = 7x + 28

Let's solve : 2x - 5{7 - (x - 6) + 3x} - 28 = 39

If the mode of 2.5, 2.7, 2.8, 2.7, 2.5, x , 2.8, 2.7, 2.8 is 2.8, then what is the value of x?

(x^(2) -3x - 28) -: (x+4) = ………..

Prove that the lines (i) 3x+4y-7=0 and 28x-21y+50=0 are mutually perpendicualr