if u have a regular calculator, you cannot put y =, if u have a graphing calculator, then you press the "y =" button
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If you put this equation in y-intercept form it is y=4/3x+20 If you have a graphing calculator just enter this in "y=" or graph it manually to find the x-intercept.
y=5a-3b+c a=12b=4c=8 a=8 b=2/3 c=2 y=5(8)-3(2/3)+(4) y=40-2+4 y=38 y = 823
y varies directly as x so y = cx for some constant c. y = 125 when x = 25 so 125 = c*25 so that c = 5 ie the relationship is y = 5x Then when x = 2, y = c*x = 5*2 = 10
y = arcsin( cos 48 ); arcsin may be seen as sin-1 on your calculator.
The y-intercept of y=3x+1 is at the point (0,1)(i worked it out on a graphics calculator my apologies if you needed working out.)